18840072 has 16 divisors (see below), whose sum is σ = 47100240. Its totient is φ = 6280016.

The previous prime is 18840071. The next prime is 18840083. The reversal of 18840072 is 27004881.

It is not an unprimeable number, because it can be changed into a prime (18840071) 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, 392478 + ... + 392525.

It is an arithmetic number, because the mean of its divisors is an integer number (2943765).

Almost surely, 2^18840072 is an apocalyptic number.

18840072 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18840072 is an abundant number, since it is smaller than the sum of its proper divisors (28260168).

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

18840072 is a wasteful number, since it uses less digits than its factorization.

18840072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 785012 (or 785008 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 30.

The square root of 18840072 is about 4340.5151767964. The cubic root of 18840072 is about 266.0893663961.

The spelling of 18840072 in words is "eighteen million, eight hundred forty thousand, seventy-two".