397974527 has 4 divisors (see below), whose sum is σ = 400357776. Its totient is φ = 395591280.

The previous prime is 397974491. The next prime is 397974541. The reversal of 397974527 is 725479793.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 397974527 - 2¹² = 397970431 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 (397974547) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1191374 + ... + 1191707.

It is an arithmetic number, because the mean of its divisors is an integer number (100089444).

Almost surely, 2^397974527 is an apocalyptic number.

397974527 is a deficient number, since it is larger than the sum of its proper divisors (2383249).

397974527 is a wasteful number, since it uses less digits than its factorization.

397974527 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2383248.

The product of its digits is 3333960, while the sum is 53.

The square root of 397974527 is about 19949.2989099868. The cubic root of 397974527 is about 735.5605435962.

The spelling of 397974527 in words is "three hundred ninety-seven million, nine hundred seventy-four thousand, five hundred twenty-seven".