38861991 has 16 divisors (see below), whose sum is σ = 65798400. Its totient is φ = 22206744.

The previous prime is 38861959. The next prime is 38862007. The reversal of 38861991 is 19916883.

It is not a de Polignac number, because 38861991 - 2⁵ = 38861959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38863991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 102621 + ... + 102998.

It is an arithmetic number, because the mean of its divisors is an integer number (4112400).

Almost surely, 2^38861991 is an apocalyptic number.

38861991 is a deficient number, since it is larger than the sum of its proper divisors (26936409).

38861991 is a wasteful number, since it uses less digits than its factorization.

38861991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205635 (or 205629 counting only the distinct ones).

The product of its digits is 93312, while the sum is 45.

The square root of 38861991 is about 6233.9386426239. The cubic root of 38861991 is about 338.7206563999.

The spelling of 38861991 in words is "thirty-eight million, eight hundred sixty-one thousand, nine hundred ninety-one".