18474720 has 96 divisors (see below), whose sum is σ = 63504000. Its totient is φ = 4477440.

The previous prime is 18474719. The next prime is 18474749. The reversal of 18474720 is 2747481.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3531 + ... + 7029.

It is an arithmetic number, because the mean of its divisors is an integer number (661500).

Almost surely, 2^18474720 is an apocalyptic number.

18474720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18474720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31752000).

18474720 is an abundant number, since it is smaller than the sum of its proper divisors (45029280).

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

18474720 is a wasteful number, since it uses less digits than its factorization.

18474720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3528 (or 3520 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 33.

The square root of 18474720 is about 4298.2228885901. Note that the first 3 decimals coincide. The cubic root of 18474720 is about 264.3580998983.

The spelling of 18474720 in words is "eighteen million, four hundred seventy-four thousand, seven hundred twenty".