18272740 has 12 divisors (see below), whose sum is σ = 38372796. Its totient is φ = 7309088.

The previous prime is 18272731. The next prime is 18272747. The reversal of 18272740 is 4727281.

It can be written as a sum of positive squares in 2 ways, for example, as 5484964 + 12787776 = 2342^2 + 3576^2 .

It is not an unprimeable number, because it can be changed into a prime (18272747) 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, 456799 + ... + 456838.

It is an arithmetic number, because the mean of its divisors is an integer number (3197733).

Almost surely, 2^18272740 is an apocalyptic number.

18272740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18272740 is an abundant number, since it is smaller than the sum of its proper divisors (20100056).

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

18272740 is a wasteful number, since it uses less digits than its factorization.

18272740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 913646 (or 913644 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 31.

The square root of 18272740 is about 4274.6625597818. The cubic root of 18272740 is about 263.3911781631.

The spelling of 18272740 in words is "eighteen million, two hundred seventy-two thousand, seven hundred forty".