397497726 has 16 divisors (see below), whose sum is σ = 883328400. Its totient is φ = 132499224.

The previous prime is 397497713. The next prime is 397497739. The reversal of 397497726 is 627794793.

It is an interprime number because it is at equal distance from previous prime (397497713) and next prime (397497739).

It is a Harshad number since it is a multiple of its sum of digits (54), and also a Moran number because the ratio is a prime number: 7361069 = 397497726 / (3 + 9 + 7 + 4 + 9 + 7 + 7 + 2 + 6).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3680481 + ... + 3680588.

It is an arithmetic number, because the mean of its divisors is an integer number (55208025).

Almost surely, 2^397497726 is an apocalyptic number.

397497726 is an abundant number, since it is smaller than the sum of its proper divisors (485830674).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

397497726 is a wasteful number, since it uses less digits than its factorization.

397497726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7361080 (or 7361074 counting only the distinct ones).

The product of its digits is 4000752, while the sum is 54.

The square root of 397497726 is about 19937.3450088019. The cubic root of 397497726 is about 735.2666754104.

The spelling of 397497726 in words is "three hundred ninety-seven million, four hundred ninety-seven thousand, seven hundred twenty-six".