397910939 has 16 divisors (see below), whose sum is σ = 426516480. Its totient is φ = 370137600.

The previous prime is 397910921. The next prime is 397910941. The reversal of 397910939 is 939019793.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 397910939 - 2⁸ = 397910683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (397912939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 247739 + ... + 249339.

It is an arithmetic number, because the mean of its divisors is an integer number (26657280).

Almost surely, 2^397910939 is an apocalyptic number.

397910939 is a deficient number, since it is larger than the sum of its proper divisors (28605541).

397910939 is a wasteful number, since it uses less digits than its factorization.

397910939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1850.

The product of its (nonzero) digits is 413343, while the sum is 50.

The square root of 397910939 is about 19947.7051061018. The cubic root of 397910939 is about 735.5213657829.

The spelling of 397910939 in words is "three hundred ninety-seven million, nine hundred ten thousand, nine hundred thirty-nine".