38939904 has 54 divisors (see below), whose sum is σ = 112279986. Its totient is φ = 12979200.

The previous prime is 38939893. The next prime is 38939909. The reversal of 38939904 is 40993983.

It can be written as a sum of positive squares in only one way, i.e., 38937600 + 2304 = 6240^2 + 48^2 .

It is a super-2 number, since 2×38939904² = 3032632247058432, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 38939904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38939909) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6147 + ... + 10754.

It is an arithmetic number, because the mean of its divisors is an integer number (2079259).

Almost surely, 2^38939904 is an apocalyptic number.

It is an amenable number.

38939904 is an abundant number, since it is smaller than the sum of its proper divisors (73340082).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

38939904 is a wasteful number, since it uses less digits than its factorization.

38939904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16923 (or 16906 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 45.

The square root of 38939904 is about 6240.1846126537. The cubic root of 38939904 is about 338.9468682230.

The spelling of 38939904 in words is "thirty-eight million, nine hundred thirty-nine thousand, nine hundred four".