18440772 has 24 divisors (see below), whose sum is σ = 49175616. Its totient is φ = 5268768.

The previous prime is 18440743. The next prime is 18440791. The reversal of 18440772 is 27704481.

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, 109683 + ... + 109850.

It is an arithmetic number, because the mean of its divisors is an integer number (2048984).

Almost surely, 2^18440772 is an apocalyptic number.

18440772 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18440772 is an abundant number, since it is smaller than the sum of its proper divisors (30734844).

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

18440772 is a wasteful number, since it uses less digits than its factorization.

18440772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219547 (or 219545 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 33.

The square root of 18440772 is about 4294.2719988375. The cubic root of 18440772 is about 264.1960779327.

The spelling of 18440772 in words is "eighteen million, four hundred forty thousand, seven hundred seventy-two".