38787921 has 24 divisors (see below), whose sum is σ = 57081024. Its totient is φ = 25378080.

The previous prime is 38787901. The next prime is 38787937. The reversal of 38787921 is 12978783.

It is not a de Polignac number, because 38787921 - 2²² = 34593617 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (38787901) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 196795 + ... + 196991.

It is an arithmetic number, because the mean of its divisors is an integer number (2378376).

Almost surely, 2^38787921 is an apocalyptic number.

It is an amenable number.

38787921 is a deficient number, since it is larger than the sum of its proper divisors (18293103).

38787921 is a wasteful number, since it uses less digits than its factorization.

38787921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 501 (or 498 counting only the distinct ones).

The product of its digits is 169344, while the sum is 45.

The square root of 38787921 is about 6227.9949421945. The cubic root of 38787921 is about 338.5053217848.

The spelling of 38787921 in words is "thirty-eight million, seven hundred eighty-seven thousand, nine hundred twenty-one".