397722907 has 8 divisors (see below), whose sum is σ = 417075840. Its totient is φ = 378745920.

The previous prime is 397722889. The next prime is 397722911. The reversal of 397722907 is 709227793.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 397722907 - 2⁷ = 397722779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (397722947) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91819 + ... + 96052.

It is an arithmetic number, because the mean of its divisors is an integer number (52134480).

Almost surely, 2^397722907 is an apocalyptic number.

397722907 is a deficient number, since it is larger than the sum of its proper divisors (19352933).

397722907 is a wasteful number, since it uses less digits than its factorization.

397722907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187973.

The product of its (nonzero) digits is 333396, while the sum is 46.

The square root of 397722907 is about 19942.9914255610. The cubic root of 397722907 is about 735.4054911567.

The spelling of 397722907 in words is "three hundred ninety-seven million, seven hundred twenty-two thousand, nine hundred seven".