1813989826 has 16 divisors (see below), whose sum is σ = 2969061408. Its totient is φ = 824342400.

The previous prime is 1813989809. The next prime is 1813989841. The reversal of 1813989826 is 6289893181.

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, 123346 + ... + 137266.

It is an arithmetic number, because the mean of its divisors is an integer number (185566338).

Almost surely, 2^1813989826 is an apocalyptic number.

1813989826 is a deficient number, since it is larger than the sum of its proper divisors (1155071582).

1813989826 is a wasteful number, since it uses less digits than its factorization.

1813989826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19857.

The product of its digits is 1492992, while the sum is 55.

The square root of 1813989826 is about 42590.9594397684. The cubic root of 1813989826 is about 1219.5837122213.

The spelling of 1813989826 in words is "one billion, eight hundred thirteen million, nine hundred eighty-nine thousand, eight hundred twenty-six".