38687021 has 8 divisors (see below), whose sum is σ = 40780320. Its totient is φ = 36599472.

The previous prime is 38687003. The next prime is 38687023. The reversal of 38687021 is 12078683.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-38687021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38687023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25346 + ... + 26828.

It is an arithmetic number, because the mean of its divisors is an integer number (5097540).

Almost surely, 2^38687021 is an apocalyptic number.

It is an amenable number.

38687021 is a deficient number, since it is larger than the sum of its proper divisors (2093299).

38687021 is a wasteful number, since it uses less digits than its factorization.

38687021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2875.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 38687021 is about 6219.8891469222. The cubic root of 38687021 is about 338.2115460834.

The spelling of 38687021 in words is "thirty-eight million, six hundred eighty-seven thousand, twenty-one".