39997457 has 8 divisors (see below), whose sum is σ = 41446080. Its totient is φ = 38574640.

The previous prime is 39997387. The next prime is 39997469. The reversal of 39997457 is 75479993.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 39997457 - 2⁸ = 39997201 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 39997399 and 39997408.

It is not an unprimeable number, because it can be changed into a prime (39997487) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3269 + ... + 9522.

It is an arithmetic number, because the mean of its divisors is an integer number (5180760).

Almost surely, 2^39997457 is an apocalyptic number.

It is an amenable number.

39997457 is a deficient number, since it is larger than the sum of its proper divisors (1448623).

39997457 is a wasteful number, since it uses less digits than its factorization.

39997457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12903.

The product of its digits is 2143260, while the sum is 53.

The square root of 39997457 is about 6324.3542753391. The cubic root of 39997457 is about 341.9879417337.

The spelling of 39997457 in words is "thirty-nine million, nine hundred ninety-seven thousand, four hundred fifty-seven".