18272730 has 32 divisors (see below), whose sum is σ = 50120064. Its totient is φ = 4176576.

The previous prime is 18272701. The next prime is 18272731. The reversal of 18272730 is 3727281.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (18272731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43297 + ... + 43716.

It is an arithmetic number, because the mean of its divisors is an integer number (1566252).

Almost surely, 2^18272730 is an apocalyptic number.

18272730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18272730 is an abundant number, since it is smaller than the sum of its proper divisors (31847334).

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

18272730 is a wasteful number, since it uses less digits than its factorization.

18272730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87030.

The product of its (nonzero) digits is 4704, while the sum is 30.

The square root of 18272730 is about 4274.6613900986. The cubic root of 18272730 is about 263.3911301149.

The spelling of 18272730 in words is "eighteen million, two hundred seventy-two thousand, seven hundred thirty".