40139864 has 16 divisors (see below), whose sum is σ = 75805800. Its totient is φ = 19924992.

The previous prime is 40139863. The next prime is 40139887. The reversal of 40139864 is 46893104.

It is a super-2 number, since 2×40139864² = 3222417363876992, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40139863) 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, 16937 + ... + 19160.

Almost surely, 2^40139864 is an apocalyptic number.

It is an amenable number.

40139864 is a deficient number, since it is larger than the sum of its proper divisors (35665936).

40139864 is a wasteful number, since it uses less digits than its factorization.

40139864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36242 (or 36238 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 40139864 is about 6335.6028915960. The cubic root of 40139864 is about 342.3933324392.

The spelling of 40139864 in words is "forty million, one hundred thirty-nine thousand, eight hundred sixty-four".