39997641 has 16 divisors (see below), whose sum is σ = 58075200. Its totient is φ = 24389568.

The previous prime is 39997631. The next prime is 39997687. The reversal of 39997641 is 14679993.

It is not a de Polignac number, because 39997641 - 2⁶ = 39997577 is a prime.

It is a super-2 number, since 2×39997641² = 3199622571129762, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (39997631) 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, 10446 + ... + 13751.

It is an arithmetic number, because the mean of its divisors is an integer number (3629700).

Almost surely, 2^39997641 is an apocalyptic number.

It is an amenable number.

39997641 is a deficient number, since it is larger than the sum of its proper divisors (18077559).

39997641 is a wasteful number, since it uses less digits than its factorization.

39997641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24248.

The product of its digits is 367416, while the sum is 48.

The square root of 39997641 is about 6324.3688222620. The cubic root of 39997641 is about 341.9884661477.

The spelling of 39997641 in words is "thirty-nine million, nine hundred ninety-seven thousand, six hundred forty-one".