18406944 has 36 divisors (see below), whose sum is σ = 52345566. Its totient is φ = 6135552.

The previous prime is 18406943. The next prime is 18406951. The reversal of 18406944 is 44960481.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 15210000 + 3196944 = 3900^2 + 1788^2 .

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

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 = 18406899 and 18406908.

It is not an unprimeable number, because it can be changed into a prime (18406943) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 31669 + ... + 32244.

Almost surely, 2^18406944 is an apocalyptic number.

It is an amenable number.

18406944 is an abundant number, since it is smaller than the sum of its proper divisors (33938622).

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

18406944 is a wasteful number, since it uses less digits than its factorization.

18406944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63929 (or 63918 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 18406944 is about 4290.3314557269. The cubic root of 18406944 is about 264.0344307711.

The spelling of 18406944 in words is "eighteen million, four hundred six thousand, nine hundred forty-four".