38687891 has 8 divisors (see below), whose sum is σ = 42254784. Its totient is φ = 35129320.

The previous prime is 38687867. The next prime is 38687911. The reversal of 38687891 is 19878683.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-38687891 is a prime.

It is not an unprimeable number, because it can be changed into a prime (38687821) 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, 11576 + ... + 14538.

It is an arithmetic number, because the mean of its divisors is an integer number (5281848).

Almost surely, 2^38687891 is an apocalyptic number.

38687891 is a deficient number, since it is larger than the sum of its proper divisors (3566893).

38687891 is a wasteful number, since it uses less digits than its factorization.

38687891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4161.

The product of its digits is 580608, while the sum is 50.

The square root of 38687891 is about 6219.9590834667. The cubic root of 38687891 is about 338.2140813164.

The spelling of 38687891 in words is "thirty-eight million, six hundred eighty-seven thousand, eight hundred ninety-one".