1840820904 has 80 divisors (see below), whose sum is σ = 5552644020. Its totient is φ = 566403840.

The previous prime is 1840820903. The next prime is 1840820953. The reversal of 1840820904 is 4090280481.

It can be written as a sum of positive squares in 2 ways, for example, as 1302488100 + 538332804 = 36090^2 + 23202^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (1840820903) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 100837 + ... + 117684.

Almost surely, 2^1840820904 is an apocalyptic number.

It is an amenable number.

1840820904 is an abundant number, since it is smaller than the sum of its proper divisors (3711823116).

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

1840820904 is a wasteful number, since it uses less digits than its factorization.

1840820904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218552 (or 218539 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 1840820904 is about 42904.7888236267. The cubic root of 1840820904 is about 1225.5673404806.

The spelling of 1840820904 in words is "one billion, eight hundred forty million, eight hundred twenty thousand, nine hundred four".