840020100 has 72 divisors (see below), whose sum is σ = 2433365088. Its totient is φ = 223737600.

The previous prime is 840020087. The next prime is 840020117. The reversal of 840020100 is 1020048.

840020100 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 840020100.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 487240 + ... + 488960.

Almost surely, 2^840020100 is an apocalyptic number.

It is an amenable number.

840020100 is an abundant number, since it is smaller than the sum of its proper divisors (1593344988).

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

840020100 is a wasteful number, since it uses less digits than its factorization.

840020100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3365 (or 3358 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 840020100 is about 28983.1002482481. The cubic root of 840020100 is about 943.5463218484.

Adding to 840020100 its reverse (1020048), we get a palindrome (841040148).

The spelling of 840020100 in words is "eight hundred forty million, twenty thousand, one hundred".