397690939 has 8 divisors (see below), whose sum is σ = 408713760. Its totient is φ = 386731200.

The previous prime is 397690921. The next prime is 397690963. The reversal of 397690939 is 939096793.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-397690939 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 397690939.

It is not an unprimeable number, because it can be changed into a prime (397691939) 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, 2844 + ... + 28345.

It is an arithmetic number, because the mean of its divisors is an integer number (51089220).

Almost surely, 2^397690939 is an apocalyptic number.

397690939 is a deficient number, since it is larger than the sum of its proper divisors (11022821).

397690939 is a wasteful number, since it uses less digits than its factorization.

397690939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31541.

The product of its (nonzero) digits is 2480058, while the sum is 55.

The square root of 397690939 is about 19942.1899248804. The cubic root of 397690939 is about 735.3857872605.

The spelling of 397690939 in words is "three hundred ninety-seven million, six hundred ninety thousand, nine hundred thirty-nine".