1806615972 has 72 divisors (see below), whose sum is σ = 5290661376. Its totient is φ = 509099904.

The previous prime is 1806615961. The next prime is 1806615977. The reversal of 1806615972 is 2795166081.

It is a super-2 number, since 2×1806615972² = 6527722540571009568, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1806615977) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 30708 + ... + 67499.

It is an arithmetic number, because the mean of its divisors is an integer number (73481408).

Almost surely, 2^1806615972 is an apocalyptic number.

1806615972 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1806615972 is an abundant number, since it is smaller than the sum of its proper divisors (3484045404).

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

1806615972 is a wasteful number, since it uses less digits than its factorization.

1806615972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98297 (or 98292 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 45.

The square root of 1806615972 is about 42504.3053348717. The cubic root of 1806615972 is about 1217.9289353249.

The spelling of 1806615972 in words is "one billion, eight hundred six million, six hundred fifteen thousand, nine hundred seventy-two".