1813893512 has 8 divisors (see below), whose sum is σ = 3401050350. Its totient is φ = 906946752.

The previous prime is 1813893511. The next prime is 1813893517. The reversal of 1813893512 is 2153983181.

It can be written as a sum of positive squares in only one way, i.e., 1519908196 + 293985316 = 38986^2 + 17146^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 1813893512.

It is not an unprimeable number, because it can be changed into a prime (1813893511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 113368337 + ... + 113368352.

Almost surely, 2^1813893512 is an apocalyptic number.

It is an amenable number.

1813893512 is a deficient number, since it is larger than the sum of its proper divisors (1587156838).

1813893512 is a wasteful number, since it uses less digits than its factorization.

1813893512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226736695 (or 226736691 counting only the distinct ones).

The product of its digits is 51840, while the sum is 41.

The square root of 1813893512 is about 42589.8287387963. The cubic root of 1813893512 is about 1219.5621271931.

The spelling of 1813893512 in words is "one billion, eight hundred thirteen million, eight hundred ninety-three thousand, five hundred twelve".