840492120 has 64 divisors (see below), whose sum is σ = 2715441120. Its totient is φ = 206889984.

The previous prime is 840492083. The next prime is 840492127. The reversal of 840492120 is 21294048.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840492127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 267829 + ... + 270948.

Almost surely, 2^840492120 is an apocalyptic number.

It is an amenable number.

840492120 is an abundant number, since it is smaller than the sum of its proper divisors (1874949000).

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

840492120 is a wasteful number, since it uses less digits than its factorization.

840492120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 538804 (or 538800 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 840492120 is about 28991.2421258559. The cubic root of 840492120 is about 943.7230197395.

The spelling of 840492120 in words is "eight hundred forty million, four hundred ninety-two thousand, one hundred twenty".