18478572 has 24 divisors (see below), whose sum is σ = 49276416. Its totient is φ = 5279568.

The previous prime is 18478571. The next prime is 18478589. The reversal of 18478572 is 27587481.

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

It is not an unprimeable number, because it can be changed into a prime (18478571) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109908 + ... + 110075.

It is an arithmetic number, because the mean of its divisors is an integer number (2053184).

Almost surely, 2^18478572 is an apocalyptic number.

18478572 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18478572 is an abundant number, since it is smaller than the sum of its proper divisors (30797844).

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

18478572 is a wasteful number, since it uses less digits than its factorization.

18478572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219997 (or 219995 counting only the distinct ones).

The product of its digits is 125440, while the sum is 42.

The square root of 18478572 is about 4298.6709574007. The cubic root of 18478572 is about 264.3764716090.

The spelling of 18478572 in words is "eighteen million, four hundred seventy-eight thousand, five hundred seventy-two".