1813315972 has 24 divisors (see below), whose sum is σ = 3447656856. Its totient is φ = 829506048.

The previous prime is 1813315969. The next prime is 1813315997. The reversal of 1813315972 is 2795133181.

It can be written as a sum of positive squares in 4 ways, for example, as 64738116 + 1748577856 = 8046^2 + 41816^2 .

It is a super-3 number, since 3×1813315972³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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, 148423 + ... + 160174.

It is an arithmetic number, because the mean of its divisors is an integer number (143652369).

Almost surely, 2^1813315972 is an apocalyptic number.

It is an amenable number.

1813315972 is a deficient number, since it is larger than the sum of its proper divisors (1634340884).

1813315972 is a wasteful number, since it uses less digits than its factorization.

1813315972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308727 (or 308725 counting only the distinct ones).

The product of its digits is 45360, while the sum is 40.

The square root of 1813315972 is about 42583.0479416399. The cubic root of 1813315972 is about 1219.4326780875.

The spelling of 1813315972 in words is "one billion, eight hundred thirteen million, three hundred fifteen thousand, nine hundred seventy-two".