8390740973391 has 12 divisors (see below), whose sum is σ = 13851381924432. Its totient is φ = 4794709127616.

The previous prime is 8390740973311. The next prime is 8390740973393. The reversal of 8390740973391 is 1933790470938.

8390740973391 is a `hidden beast` number, since 8 + 3 + 90 + 74 + 0 + 97 + 3 + 391 = 666.

It is not a de Polignac number, because 8390740973391 - 2¹⁸ = 8390740711247 is a prime.

It is a hoax number, since the sum of its digits (63) coincides with the sum of the digits of its distinct prime factors.

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: 133186364657 = 8390740973391 / (8 + 3 + 9 + 0 + 7 + 4 + 0 + 9 + 7 + 3 + 3 + 9 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8390740973393) 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, 66593182266 + ... + 66593182391.

It is an arithmetic number, because the mean of its divisors is an integer number (1154281827036).

Almost surely, 2^{8390740973391} is an apocalyptic number.

8390740973391 is a deficient number, since it is larger than the sum of its proper divisors (5460640951041).

8390740973391 is a wasteful number, since it uses less digits than its factorization.

8390740973391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133186364670 (or 133186364667 counting only the distinct ones).

The product of its (nonzero) digits is 30862944, while the sum is 63.

The spelling of 8390740973391 in words is "eight trillion, three hundred ninety billion, seven hundred forty million, nine hundred seventy-three thousand, three hundred ninety-one".