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30938746 = 215469373
BaseRepresentation
bin111011000000…
…1011001111010
32011012211222111
41312001121322
530410014441
63023042534
7523655266
oct166013172
964184874
1030938746
1116511813
12a44044a
136543367
1441750a6
152ab2081
hex1d8167a

30938746 has 4 divisors (see below), whose sum is σ = 46408122. Its totient is φ = 15469372.

The previous prime is 30938741. The next prime is 30938777. The reversal of 30938746 is 64783903.

30938746 is nontrivially palindromic in base 12.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 64783903 = 607910657.

It can be written as a sum of positive squares in only one way, i.e., 20602521 + 10336225 = 4539^2 + 3215^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 30938699 and 30938708.

It is not an unprimeable number, because it can be changed into a prime (30938741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7734685 + ... + 7734688.

Almost surely, 230938746 is an apocalyptic number.

30938746 is a deficient number, since it is larger than the sum of its proper divisors (15469376).

30938746 is a wasteful number, since it uses less digits than its factorization.

30938746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15469375.

The product of its (nonzero) digits is 108864, while the sum is 40.

The square root of 30938746 is about 5562.2608712645. The cubic root of 30938746 is about 313.9310232954.

It can be divided in two parts, 30938 and 746, that added together give a square (31684 = 1782).

The spelling of 30938746 in words is "thirty million, nine hundred thirty-eight thousand, seven hundred forty-six".

Divisors: 1 2 15469373 30938746