39916881 has 12 divisors (see below), whose sum is σ = 59793552. Its totient is φ = 26611092.

The previous prime is 39916859. The next prime is 39916909. The reversal of 39916881 is 18861993.

It is not a de Polignac number, because 39916881 - 2⁶ = 39916817 is a prime.

It is a super-2 number, since 2×39916881² = 3186714777536322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (39916801) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 81891 + ... + 82376.

It is an arithmetic number, because the mean of its divisors is an integer number (4982796).

Almost surely, 2^39916881 is an apocalyptic number.

It is an amenable number.

39916881 is a deficient number, since it is larger than the sum of its proper divisors (19876671).

39916881 is an equidigital number, since it uses as much as digits as its factorization.

39916881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164282 (or 164270 counting only the distinct ones).

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

The square root of 39916881 is about 6317.9807692015. The cubic root of 39916881 is about 341.7581392469.

The spelling of 39916881 in words is "thirty-nine million, nine hundred sixteen thousand, eight hundred eighty-one".