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30403021 = 11171943199
BaseRepresentation
bin111001111111…
…0100111001101
32010012122002211
41303332213031
530240344041
63003350421
7516264355
oct163764715
963178084
1030403021
1116186270
12a222411
1363b656c
144075b65
152a08481
hex1cfe9cd

30403021 has 32 divisors (see below), whose sum is σ = 38016000. Its totient is φ = 23950080.

The previous prime is 30403013. The next prime is 30403039. The reversal of 30403021 is 12030403.

It is not a de Polignac number, because 30403021 - 23 = 30403013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 30402992 and 30403010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30403091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 152680 + ... + 152878.

It is an arithmetic number, because the mean of its divisors is an integer number (1188000).

Almost surely, 230403021 is an apocalyptic number.

It is an amenable number.

30403021 is a deficient number, since it is larger than the sum of its proper divisors (7612979).

30403021 is a wasteful number, since it uses less digits than its factorization.

30403021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289.

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 30403021 is about 5513.8934519992. The cubic root of 30403021 is about 312.1084880504.

Adding to 30403021 its reverse (12030403), we get a palindrome (42433424).

The spelling of 30403021 in words is "thirty million, four hundred three thousand, twenty-one".

Divisors: 1 11 17 19 43 187 199 209 323 473 731 817 2189 3383 3553 3781 8041 8557 8987 13889 37213 41591 64277 94127 145469 152779 162583 707047 1600159 1788413 2763911 30403021