1815920044 has 12 divisors (see below), whose sum is σ = 3213567000. Its totient is φ = 897758048.

The previous prime is 1815920033. The next prime is 1815920063. The reversal of 1815920044 is 4400295181.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1815919991 and 1815920009.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2550094 + ... + 2550805.

It is an arithmetic number, because the mean of its divisors is an integer number (267797250).

Almost surely, 2^1815920044 is an apocalyptic number.

It is an amenable number.

1815920044 is a deficient number, since it is larger than the sum of its proper divisors (1397646956).

1815920044 is a wasteful number, since it uses less digits than its factorization.

1815920044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5100992 (or 5100990 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 1815920044 is about 42613.6133647453. The cubic root of 1815920044 is about 1220.0161343383.

The spelling of 1815920044 in words is "one billion, eight hundred fifteen million, nine hundred twenty thousand, forty-four".