38687999 has 16 divisors (see below), whose sum is σ = 45480000. Its totient is φ = 32895072.

The previous prime is 38687993. The next prime is 38688007. The reversal of 38687999 is 99978683.

It is not a de Polignac number, because 38687999 - 2²⁰ = 37639423 is a prime.

It is a super-2 number, since 2×38687999² = 2993522533248002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38687993) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50729 + ... + 51485.

It is an arithmetic number, because the mean of its divisors is an integer number (2842500).

Almost surely, 2^38687999 is an apocalyptic number.

38687999 is a deficient number, since it is larger than the sum of its proper divisors (6792001).

38687999 is an equidigital number, since it uses as much as digits as its factorization.

38687999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 927 (or 913 counting only the distinct ones).

The product of its digits is 5878656, while the sum is 59.

The square root of 38687999 is about 6219.9677651898. The cubic root of 38687999 is about 338.2143960324.

The spelling of 38687999 in words is "thirty-eight million, six hundred eighty-seven thousand, nine hundred ninety-nine".