18413972 has 12 divisors (see below), whose sum is σ = 32254740. Its totient is φ = 9198336.

The previous prime is 18413963. The next prime is 18413977. The reversal of 18413972 is 27931481.

It can be written as a sum of positive squares in 2 ways, for example, as 13808656 + 4605316 = 3716^2 + 2146^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18413977) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6338 + ... + 8774.

It is an arithmetic number, because the mean of its divisors is an integer number (2687895).

Almost surely, 2^18413972 is an apocalyptic number.

It is an amenable number.

18413972 is a deficient number, since it is larger than the sum of its proper divisors (13840768).

18413972 is a wasteful number, since it uses less digits than its factorization.

18413972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4330 (or 4328 counting only the distinct ones).

The product of its digits is 12096, while the sum is 35.

The square root of 18413972 is about 4291.1504284982. The cubic root of 18413972 is about 264.0680303710.

The spelling of 18413972 in words is "eighteen million, four hundred thirteen thousand, nine hundred seventy-two".