38992891 has 4 divisors (see below), whose sum is σ = 44563312. Its totient is φ = 33422472.

The previous prime is 38992871. The next prime is 38992901. The reversal of 38992891 is 19829983.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 38992891 - 2⁵ = 38992859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38992831) 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, 2785200 + ... + 2785213.

It is an arithmetic number, because the mean of its divisors is an integer number (11140828).

Almost surely, 2^38992891 is an apocalyptic number.

38992891 is a deficient number, since it is larger than the sum of its proper divisors (5570421).

38992891 is an equidigital number, since it uses as much as digits as its factorization.

38992891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5570420.

The product of its digits is 279936, while the sum is 49.

The square root of 38992891 is about 6244.4287969357. The cubic root of 38992891 is about 339.1005378167.

The spelling of 38992891 in words is "thirty-eight million, nine hundred ninety-two thousand, eight hundred ninety-one".