39997397 has 6 divisors (see below), whose sum is σ = 43964214. Its totient is φ = 36361160.

The previous prime is 39997387. The next prime is 39997469. The reversal of 39997397 is 79379993.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 38763076 + 1234321 = 6226^2 + 1111^2 .

It is not a de Polignac number, because 39997397 - 2⁴ = 39997381 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 (39997327) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 165158 + ... + 165399.

It is an arithmetic number, because the mean of its divisors is an integer number (7327369).

Almost surely, 2^39997397 is an apocalyptic number.

It is an amenable number.

39997397 is a deficient number, since it is larger than the sum of its proper divisors (3966817).

39997397 is a wasteful number, since it uses less digits than its factorization.

39997397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330579 (or 330568 counting only the distinct ones).

The product of its digits is 2893401, while the sum is 56.

The square root of 39997397 is about 6324.3495317700. The cubic root of 39997397 is about 341.9877707288.

The spelling of 39997397 in words is "thirty-nine million, nine hundred ninety-seven thousand, three hundred ninety-seven".