15668042 has 16 divisors (see below), whose sum is σ = 25403112. Its totient is φ = 7204800.

The previous prime is 15668041. The next prime is 15668047. The reversal of 15668042 is 24086651.

It can be written as a sum of positive squares in 4 ways, for example, as 3129361 + 12538681 = 1769^2 + 3541^2 .

It is a super-2 number, since 2×15668042² = 490975080227528, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (15668041) 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 in 7 ways as a sum of consecutive naturals, for example, 7292 + ... + 9192.

Almost surely, 2^15668042 is an apocalyptic number.

15668042 is a deficient number, since it is larger than the sum of its proper divisors (9735070).

15668042 is a wasteful number, since it uses less digits than its factorization.

15668042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2233.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 15668042 is about 3958.2877611412. The cubic root of 15668042 is about 250.2293468690.

The spelling of 15668042 in words is "fifteen million, six hundred sixty-eight thousand, forty-two".