397656707 has 32 divisors (see below), whose sum is σ = 501811200. Its totient is φ = 313756800.

The previous prime is 397656703. The next prime is 397656751. The reversal of 397656707 is 707656793.

It is not a de Polignac number, because 397656707 - 2² = 397656703 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (397656703) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 273332 + ... + 274782.

It is an arithmetic number, because the mean of its divisors is an integer number (15681600).

Almost surely, 2^397656707 is an apocalyptic number.

397656707 is a deficient number, since it is larger than the sum of its proper divisors (104154493).

397656707 is a wasteful number, since it uses less digits than its factorization.

397656707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1536 (or 1522 counting only the distinct ones).

The product of its (nonzero) digits is 1666980, while the sum is 50.

The square root of 397656707 is about 19941.3316255460. The cubic root of 397656707 is about 735.3646867474.

The spelling of 397656707 in words is "three hundred ninety-seven million, six hundred fifty-six thousand, seven hundred seven".