18738720 has 432 divisors, whose sum is σ = 86329152. Its totient is φ = 3594240.

The previous prime is 18738719. The next prime is 18738757. The reversal of 18738720 is 2783781.

It is a super-2 number, since 2×18738720² = 702279254476800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1441434 + ... + 1441446.

It is an arithmetic number, because the mean of its divisors is an integer number (199836).

Almost surely, 2^18738720 is an apocalyptic number.

18738720 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 18738720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43164576).

18738720 is an abundant number, since it is smaller than the sum of its proper divisors (67590432).

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

18738720 is a wasteful number, since it uses less digits than its factorization.

18738720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65 (or 41 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 36.

The square root of 18738720 is about 4328.8243207596. The cubic root of 18738720 is about 265.6113569925.

The spelling of 18738720 in words is "eighteen million, seven hundred thirty-eight thousand, seven hundred twenty".