397697077 has 4 divisors (see below), whose sum is σ = 398615980. Its totient is φ = 396778176.

The previous prime is 397697063. The next prime is 397697093. The reversal of 397697077 is 770796793.

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

It can be written as a sum of positive squares in 2 ways, for example, as 75099556 + 322597521 = 8666^2 + 17961^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-397697077 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 (397697177) 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, 458802 + ... + 459667.

It is an arithmetic number, because the mean of its divisors is an integer number (99653995).

Almost surely, 2^397697077 is an apocalyptic number.

It is an amenable number.

397697077 is a deficient number, since it is larger than the sum of its proper divisors (918903).

397697077 is an equidigital number, since it uses as much as digits as its factorization.

397697077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 918902.

The product of its (nonzero) digits is 3500658, while the sum is 55.

The square root of 397697077 is about 19942.3438191202. The cubic root of 397697077 is about 735.3895705793.

The spelling of 397697077 in words is "three hundred ninety-seven million, six hundred ninety-seven thousand, seventy-seven".