18289572 has 24 divisors (see below), whose sum is σ = 48772416. Its totient is φ = 5225568.

The previous prime is 18289561. The next prime is 18289591. The reversal of 18289572 is 27598281.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 108783 + ... + 108950.

It is an arithmetic number, because the mean of its divisors is an integer number (2032184).

Almost surely, 2^18289572 is an apocalyptic number.

18289572 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18289572 is an abundant number, since it is smaller than the sum of its proper divisors (30482844).

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

18289572 is a wasteful number, since it uses less digits than its factorization.

18289572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217747 (or 217745 counting only the distinct ones).

The product of its digits is 80640, while the sum is 42.

The square root of 18289572 is about 4276.6309169719. The cubic root of 18289572 is about 263.4720279193.

The spelling of 18289572 in words is "eighteen million, two hundred eighty-nine thousand, five hundred seventy-two".