18972944 has 40 divisors (see below), whose sum is σ = 39060000. Its totient is φ = 8902656.

The previous prime is 18972937. The next prime is 18972973. The reversal of 18972944 is 44927981.

It is a junction number, because it is equal to n+sod(n) for n = 18972895 and 18972904.

It is a congruent number.

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, 42032 + ... + 42480.

It is an arithmetic number, because the mean of its divisors is an integer number (976500).

Almost surely, 2^18972944 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18972944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19530000).

18972944 is an abundant number, since it is smaller than the sum of its proper divisors (20087056).

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

18972944 is a wasteful number, since it uses less digits than its factorization.

18972944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 615 (or 609 counting only the distinct ones).

The product of its digits is 145152, while the sum is 44.

The square root of 18972944 is about 4355.7943018467. The cubic root of 18972944 is about 266.7134445717.

The spelling of 18972944 in words is "eighteen million, nine hundred seventy-two thousand, nine hundred forty-four".