397657615 has 16 divisors (see below), whose sum is σ = 497122560. Its totient is φ = 305026560.

The previous prime is 397657583. The next prime is 397657633. The reversal of 397657615 is 516756793.

It is not a de Polignac number, because 397657615 - 2⁵ = 397657583 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 (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5127 + ... + 28663.

It is an arithmetic number, because the mean of its divisors is an integer number (31070160).

Almost surely, 2^397657615 is an apocalyptic number.

397657615 is a deficient number, since it is larger than the sum of its proper divisors (99464945).

397657615 is a wasteful number, since it uses less digits than its factorization.

397657615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23682.

The product of its digits is 1190700, while the sum is 49.

The square root of 397657615 is about 19941.3543923175. The cubic root of 397657615 is about 735.3652464518.

The spelling of 397657615 in words is "three hundred ninety-seven million, six hundred fifty-seven thousand, six hundred fifteen".