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30807421 = 37832633
BaseRepresentation
bin111010110000…
…1010101111101
32010222011211121
41311201111331
530341314141
63020150541
7522600361
oct165412575
963864747
1030807421
1116432087
12a398451
1364c8658
14413d2a1
152a881d1
hex1d6157d

30807421 has 4 divisors (see below), whose sum is σ = 31640092. Its totient is φ = 29974752.

The previous prime is 30807409. The next prime is 30807431. The reversal of 30807421 is 12470803.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 25100100 + 5707321 = 5010^2 + 2389^2 .

It is a cyclic number.

It is not a de Polignac number, because 30807421 - 213 = 30799229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30807431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 416280 + ... + 416353.

It is an arithmetic number, because the mean of its divisors is an integer number (7910023).

Almost surely, 230807421 is an apocalyptic number.

It is an amenable number.

30807421 is a deficient number, since it is larger than the sum of its proper divisors (832671).

30807421 is an equidigital number, since it uses as much as digits as its factorization.

30807421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 832670.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 30807421 is about 5550.4433156280. The cubic root of 30807421 is about 313.4862146904.

It can be divided in two parts, 3080 and 7421, that added together give a palindrome (10501).

The spelling of 30807421 in words is "thirty million, eight hundred seven thousand, four hundred twenty-one".

Divisors: 1 37 832633 30807421