1815206772 has 24 divisors (see below), whose sum is σ = 4239784192. Its totient is φ = 604454400.

The previous prime is 1815206741. The next prime is 1815206821. The reversal of 1815206772 is 2776025181.

It is a super-2 number, since 2×1815206772² = 6589951250229319968, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1815206772.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64429 + ... + 88212.

Almost surely, 2^1815206772 is an apocalyptic number.

1815206772 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1815206772 is an abundant number, since it is smaller than the sum of its proper divisors (2424577420).

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

1815206772 is a wasteful number, since it uses less digits than its factorization.

1815206772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153639 (or 153637 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 39.

The square root of 1815206772 is about 42605.2434801164. The cubic root of 1815206772 is about 1219.8563774314.

The spelling of 1815206772 in words is "one billion, eight hundred fifteen million, two hundred six thousand, seven hundred seventy-two".