840428621900 has 36 divisors (see below), whose sum is σ = 2084262984048. Its totient is φ = 288146955840.

The previous prime is 840428621887. The next prime is 840428621951. The reversal of 840428621900 is 9126824048.

It is a super-2 number, since 2×840428621900² (a number of 25 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

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, 600305459 + ... + 600306858.

Almost surely, 2^840428621900 is an apocalyptic number.

It is an amenable number.

840428621900 is an abundant number, since it is smaller than the sum of its proper divisors (1243834362148).

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

840428621900 is a wasteful number, since it uses less digits than its factorization.

840428621900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1200612338 (or 1200612331 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 44.

The spelling of 840428621900 in words is "eight hundred forty billion, four hundred twenty-eight million, six hundred twenty-one thousand, nine hundred".