840557934 has 24 divisors (see below), whose sum is σ = 1870432200. Its totient is φ = 272613168.

The previous prime is 840557923. The next prime is 840557941. The reversal of 840557934 is 439755048.

840557934 is a `hidden beast` number, since 8 + 4 + 0 + 557 + 93 + 4 = 666.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 840557934.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 630384 + ... + 631715.

It is an arithmetic number, because the mean of its divisors is an integer number (77934675).

Almost surely, 2^840557934 is an apocalyptic number.

840557934 is an abundant number, since it is smaller than the sum of its proper divisors (1029874266).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

840557934 is a wasteful number, since it uses less digits than its factorization.

840557934 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1262144 (or 1262141 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 45.

The square root of 840557934 is about 28992.3771705599. The cubic root of 840557934 is about 943.7476515650.

The spelling of 840557934 in words is "eight hundred forty million, five hundred fifty-seven thousand, nine hundred thirty-four".