38805991 has 16 divisors (see below), whose sum is σ = 47232000. Its totient is φ = 31809624.

The previous prime is 38805989. The next prime is 38806003. The reversal of 38805991 is 19950883.

It is not a de Polignac number, because 38805991 - 2¹ = 38805989 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 (38805941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5430 + ... + 10348.

It is an arithmetic number, because the mean of its divisors is an integer number (2952000).

Almost surely, 2^38805991 is an apocalyptic number.

38805991 is a deficient number, since it is larger than the sum of its proper divisors (8426009).

38805991 is an equidigital number, since it uses as much as digits as its factorization.

38805991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4963 (or 4949 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 43.

The square root of 38805991 is about 6229.4454809397. The cubic root of 38805991 is about 338.5578797409.

The spelling of 38805991 in words is "thirty-eight million, eight hundred five thousand, nine hundred ninety-one".