397928775 has 24 divisors (see below), whose sum is σ = 696611664. Its totient is φ = 199744000.

The previous prime is 397928759. The next prime is 397928813. The reversal of 397928775 is 577829793.

It is not a de Polignac number, because 397928775 - 2⁴ = 397928759 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 154776 + ... + 157325.

It is an arithmetic number, because the mean of its divisors is an integer number (29025486).

Almost surely, 2^397928775 is an apocalyptic number.

397928775 is a deficient number, since it is larger than the sum of its proper divisors (298682889).

397928775 is a wasteful number, since it uses less digits than its factorization.

397928775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312131 (or 312126 counting only the distinct ones).

The product of its digits is 6667920, while the sum is 57.

The square root of 397928775 is about 19948.1521700633. The cubic root of 397928775 is about 735.5323553133.

The spelling of 397928775 in words is "three hundred ninety-seven million, nine hundred twenty-eight thousand, seven hundred seventy-five".