18672231 has 8 divisors (see below), whose sum is σ = 26206720. Its totient is φ = 11792952.

The previous prime is 18672221. The next prime is 18672253. The reversal of 18672231 is 13227681.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18672231 - 2¹³ = 18664039 is a prime.

It is a super-2 number, since 2×18672231² = 697304421034722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18672221) 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, 163735 + ... + 163848.

It is an arithmetic number, because the mean of its divisors is an integer number (3275840).

Almost surely, 2^18672231 is an apocalyptic number.

18672231 is a deficient number, since it is larger than the sum of its proper divisors (7534489).

18672231 is a wasteful number, since it uses less digits than its factorization.

18672231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327605.

The product of its digits is 4032, while the sum is 30.

The square root of 18672231 is about 4321.1376974126. The cubic root of 18672231 is about 265.2968360039.

The spelling of 18672231 in words is "eighteen million, six hundred seventy-two thousand, two hundred thirty-one".