397980457 has 4 divisors (see below), whose sum is σ = 454834816. Its totient is φ = 341126100.

The previous prime is 397980419. The next prime is 397980461. The reversal of 397980457 is 754089793.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 397980457 - 2¹¹ = 397978409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (397980467) 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, 28427169 + ... + 28427182.

It is an arithmetic number, because the mean of its divisors is an integer number (113708704).

Almost surely, 2^397980457 is an apocalyptic number.

It is an amenable number.

397980457 is a deficient number, since it is larger than the sum of its proper divisors (56854359).

397980457 is an equidigital number, since it uses as much as digits as its factorization.

397980457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56854358.

The product of its (nonzero) digits is 1905120, while the sum is 52.

The square root of 397980457 is about 19949.4475362101. The cubic root of 397980457 is about 735.5641969727.

The spelling of 397980457 in words is "three hundred ninety-seven million, nine hundred eighty thousand, four hundred fifty-seven".