397931137709 has 8 divisors (see below), whose sum is σ = 458803032000. Its totient is φ = 338065390656.

The previous prime is 397931137693. The next prime is 397931137727. The reversal of 397931137709 is 907731139793.

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

It is not a de Polignac number, because 397931137709 - 2⁴ = 397931137693 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397931137309) 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, 251535959 + ... + 251537540.

It is an arithmetic number, because the mean of its divisors is an integer number (57350379000).

Almost surely, 2^397931137709 is an apocalyptic number.

It is an amenable number.

397931137709 is a deficient number, since it is larger than the sum of its proper divisors (60871894291).

397931137709 is a wasteful number, since it uses less digits than its factorization.

397931137709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 503073619.

The product of its (nonzero) digits is 6751269, while the sum is 59.

The spelling of 397931137709 in words is "three hundred ninety-seven billion, nine hundred thirty-one million, one hundred thirty-seven thousand, seven hundred nine".