18455772 has 48 divisors (see below), whose sum is σ = 45061632. Its totient is φ = 5873280.

The previous prime is 18455747. The next prime is 18455791. The reversal of 18455772 is 27755481.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 18455772.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23872 + ... + 24632.

It is an arithmetic number, because the mean of its divisors is an integer number (938784).

Almost surely, 2^18455772 is an apocalyptic number.

18455772 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18455772 is an abundant number, since it is smaller than the sum of its proper divisors (26605860).

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

18455772 is a wasteful number, since it uses less digits than its factorization.

18455772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 858 (or 856 counting only the distinct ones).

The product of its digits is 78400, while the sum is 39.

The square root of 18455772 is about 4296.0181563862. The cubic root of 18455772 is about 264.2676922004.

The spelling of 18455772 in words is "eighteen million, four hundred fifty-five thousand, seven hundred seventy-two".