840464631 has 24 divisors (see below), whose sum is σ = 1262876160. Its totient is φ = 537969600.

The previous prime is 840464623. The next prime is 840464633. The reversal of 840464631 is 136464048.

840464631 is a `hidden beast` number, since 8 + 4 + 0 + 4 + 646 + 3 + 1 = 666.

It is not a de Polignac number, because 840464631 - 2³ = 840464623 is a prime.

It is a super-2 number, since 2×840464631² = 1412761591923932322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840464633) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 38346 + ... + 56136.

It is an arithmetic number, because the mean of its divisors is an integer number (52619840).

Almost surely, 2^840464631 is an apocalyptic number.

840464631 is a deficient number, since it is larger than the sum of its proper divisors (422411529).

840464631 is a wasteful number, since it uses less digits than its factorization.

840464631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18007 (or 18004 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 36.

The square root of 840464631 is about 28990.7680305300. The cubic root of 840464631 is about 943.7127312096.

The spelling of 840464631 in words is "eight hundred forty million, four hundred sixty-four thousand, six hundred thirty-one".