1815797272 has 32 divisors (see below), whose sum is σ = 3435436800. Its totient is φ = 899718400.

The previous prime is 1815797267. The next prime is 1815797273. The reversal of 1815797272 is 2727975181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1815797273) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 427254 + ... + 431482.

It is an arithmetic number, because the mean of its divisors is an integer number (107357400).

Almost surely, 2^1815797272 is an apocalyptic number.

It is an amenable number.

1815797272 is a deficient number, since it is larger than the sum of its proper divisors (1619639528).

1815797272 is a wasteful number, since it uses less digits than its factorization.

1815797272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4707 (or 4703 counting only the distinct ones).

The product of its digits is 493920, while the sum is 49.

The square root of 1815797272 is about 42612.1728148190. The cubic root of 1815797272 is about 1219.9886391489.

The spelling of 1815797272 in words is "one billion, eight hundred fifteen million, seven hundred ninety-seven thousand, two hundred seventy-two".