18474444 has 36 divisors (see below), whose sum is σ = 49447944. Its totient is φ = 5795712.

The previous prime is 18474439. The next prime is 18474457. The reversal of 18474444 is 44447481.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×18474444² = 682610162218272, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 18474399 and 18474408.

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 11 ways as a sum of consecutive naturals, for example, 14482 + ... + 15705.

It is an arithmetic number, because the mean of its divisors is an integer number (1373554).

Almost surely, 2^18474444 is an apocalyptic number.

It is an amenable number.

18474444 is an abundant number, since it is smaller than the sum of its proper divisors (30973500).

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

18474444 is a wasteful number, since it uses less digits than its factorization.

18474444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30214 (or 30209 counting only the distinct ones).

The product of its digits is 57344, while the sum is 36.

The square root of 18474444 is about 4298.1907821780. The cubic root of 18474444 is about 264.3567834471.

The spelling of 18474444 in words is "eighteen million, four hundred seventy-four thousand, four hundred forty-four".