840088836 has 18 divisors (see below), whose sum is σ = 2123557982. Its totient is φ = 280029600.

The previous prime is 840088829. The next prime is 840088841. The reversal of 840088836 is 638880048.

It can be written as a sum of positive squares in only one way, i.e., 821166336 + 18922500 = 28656^2 + 4350^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a junction number, because it is equal to n+sod(n) for n = 840088791 and 840088800.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11667865 + ... + 11667936.

Almost surely, 2^840088836 is an apocalyptic number.

It is an amenable number.

840088836 is an abundant number, since it is smaller than the sum of its proper divisors (1283469146).

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

840088836 is a wasteful number, since it uses less digits than its factorization.

840088836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23335811 (or 23335806 counting only the distinct ones).

The product of its (nonzero) digits is 294912, while the sum is 45.

The square root of 840088836 is about 28984.2860184618. The cubic root of 840088836 is about 943.5720568799.

The spelling of 840088836 in words is "eight hundred forty million, eighty-eight thousand, eight hundred thirty-six".