39116991 has 16 divisors (see below), whose sum is σ = 55203840. Its totient is φ = 24569280.

The previous prime is 39116981. The next prime is 39117007. The reversal of 39116991 is 19961193.

It is a happy number.

It is not a de Polignac number, because 39116991 - 2²² = 34922687 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39116981) 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, 9091 + ... + 12683.

It is an arithmetic number, because the mean of its divisors is an integer number (3450240).

Almost surely, 2^39116991 is an apocalyptic number.

39116991 is a deficient number, since it is larger than the sum of its proper divisors (16086849).

39116991 is a wasteful number, since it uses less digits than its factorization.

39116991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3806.

The product of its digits is 13122, while the sum is 39.

The square root of 39116991 is about 6254.3577607937. The cubic root of 39116991 is about 339.4599008544.

The spelling of 39116991 in words is "thirty-nine million, one hundred sixteen thousand, nine hundred ninety-one".