18683172 has 36 divisors (see below), whose sum is σ = 47489260. Its totient is φ = 6193152.

The previous prime is 18683143. The next prime is 18683177. The reversal of 18683172 is 27138681.

It can be written as a sum of positive squares in 2 ways, for example, as 2232036 + 16451136 = 1494^2 + 4056^2 .

It is a tau number, because it is divible by the number of its divisors (36).

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

It is not an unprimeable number, because it can be changed into a prime (18683177) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5604 + ... + 8292.

Almost surely, 2^18683172 is an apocalyptic number.

18683172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18683172 is an abundant number, since it is smaller than the sum of its proper divisors (28806088).

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

18683172 is a wasteful number, since it uses less digits than its factorization.

18683172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2892 (or 2887 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 18683172 is about 4322.4034980552. The cubic root of 18683172 is about 265.3486428097.

The spelling of 18683172 in words is "eighteen million, six hundred eighty-three thousand, one hundred seventy-two".