840808840 has 32 divisors (see below), whose sum is σ = 1910559960. Its totient is φ = 332992000.

The previous prime is 840808807. The next prime is 840808883. The reversal of 840808840 is 48808048.

It can be written as a sum of positive squares in 4 ways, for example, as 697910724 + 142898116 = 26418^2 + 11954^2 .

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 840808793 and 840808802.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100021 + ... + 108100.

Almost surely, 2^840808840 is an apocalyptic number.

It is an amenable number.

840808840 is an abundant number, since it is smaller than the sum of its proper divisors (1069751120).

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

840808840 is a wasteful number, since it uses less digits than its factorization.

840808840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208233 (or 208229 counting only the distinct ones).

The product of its (nonzero) digits is 65536, while the sum is 40.

The square root of 840808840 is about 28996.7039506217. The cubic root of 840808840 is about 943.8415449112.

The spelling of 840808840 in words is "eight hundred forty million, eight hundred eight thousand, eight hundred forty".