307971557397 has 12 divisors (see below), whose sum is σ = 508397491680. Its totient is φ = 175983747048.

The previous prime is 307971557357. The next prime is 307971557407. The reversal of 307971557397 is 793755179703.

307971557397 is a `hidden beast` number, since 3 + 0 + 7 + 9 + 71 + 557 + 3 + 9 + 7 = 666.

It is not a de Polignac number, because 307971557397 - 2¹² = 307971553301 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63), and also a Moran number because the ratio is a prime number: 4888437419 = 307971557397 / (3 + 0 + 7 + 9 + 7 + 1 + 5 + 5 + 7 + 3 + 9 + 7).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (307971557357) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2444218647 + ... + 2444218772.

It is an arithmetic number, because the mean of its divisors is an integer number (42366457640).

Almost surely, 2^307971557397 is an apocalyptic number.

It is an amenable number.

307971557397 is a deficient number, since it is larger than the sum of its proper divisors (200425934283).

307971557397 is a wasteful number, since it uses less digits than its factorization.

307971557397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4888437432 (or 4888437429 counting only the distinct ones).

The product of its (nonzero) digits is 43758225, while the sum is 63.

The spelling of 307971557397 in words is "three hundred seven billion, nine hundred seventy-one million, five hundred fifty-seven thousand, three hundred ninety-seven".