397738477 has 4 divisors (see below), whose sum is σ = 421134876. Its totient is φ = 374342080.

The previous prime is 397738459. The next prime is 397738501. The reversal of 397738477 is 774837793.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 774837793 = 53 ⋅14619581.

It can be written as a sum of positive squares in 2 ways, for example, as 270635401 + 127103076 = 16451^2 + 11274^2 .

It is a cyclic number.

It is not a de Polignac number, because 397738477 - 2¹⁵ = 397705709 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 (397738427) 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, 11698174 + ... + 11698207.

It is an arithmetic number, because the mean of its divisors is an integer number (105283719).

Almost surely, 2^397738477 is an apocalyptic number.

It is an amenable number.

397738477 is a deficient number, since it is larger than the sum of its proper divisors (23396399).

397738477 is a wasteful number, since it uses less digits than its factorization.

397738477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23396398.

The product of its digits is 6223392, while the sum is 55.

The square root of 397738477 is about 19943.3817844417. The cubic root of 397738477 is about 735.4150875482.

The spelling of 397738477 in words is "three hundred ninety-seven million, seven hundred thirty-eight thousand, four hundred seventy-seven".