396969788781 has 6 divisors (see below), whose sum is σ = 573400806030. Its totient is φ = 264646525848.

The previous prime is 396969788777. The next prime is 396969788791. The reversal of 396969788781 is 187887969693.

396969788781 is a `hidden beast` number, since 396 + 9 + 6 + 9 + 78 + 87 + 81 = 666.

It can be written as a sum of positive squares in only one way, i.e., 264873886281 + 132095902500 = 514659^2 + 363450^2 .

It is not a de Polignac number, because 396969788781 - 2² = 396969788777 is a prime.

It is a super-2 number, since 2×396969788781² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 396969788781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (396969788711) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22053877146 + ... + 22053877163.

It is an arithmetic number, because the mean of its divisors is an integer number (95566801005).

Almost surely, 2^396969788781 is an apocalyptic number.

It is an amenable number.

396969788781 is a deficient number, since it is larger than the sum of its proper divisors (176431017249).

396969788781 is a wasteful number, since it uses less digits than its factorization.

396969788781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44107754315 (or 44107754312 counting only the distinct ones).

The product of its digits is 1975228416, while the sum is 81.

The spelling of 396969788781 in words is "three hundred ninety-six billion, nine hundred sixty-nine million, seven hundred eighty-eight thousand, seven hundred eighty-one".