18773872 has 60 divisors (see below), whose sum is σ = 40437144. Its totient is φ = 8436480.

The previous prime is 18773861. The next prime is 18773873. The reversal of 18773872 is 27837781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18773873) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 143247 + ... + 143377.

Almost surely, 2^18773872 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 18773872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20218572).

18773872 is an abundant number, since it is smaller than the sum of its proper divisors (21663272).

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

18773872 is a wasteful number, since it uses less digits than its factorization.

18773872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218 (or 199 counting only the distinct ones).

The product of its digits is 131712, while the sum is 43.

The square root of 18773872 is about 4332.8826432296. The cubic root of 18773872 is about 265.7773401939. Note that the first 3 decimals are identical.

The spelling of 18773872 in words is "eighteen million, seven hundred seventy-three thousand, eight hundred seventy-two".