18331226 has 4 divisors (see below), whose sum is σ = 27496842. Its totient is φ = 9165612.

The previous prime is 18331217. The next prime is 18331231. The reversal of 18331226 is 62213381.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 62213381 = 29 ⋅2145289.

It can be written as a sum of positive squares in only one way, i.e., 17430625 + 900601 = 4175^2 + 949^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 18331195 and 18331204.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4582805 + ... + 4582808.

Almost surely, 2^18331226 is an apocalyptic number.

18331226 is a deficient number, since it is larger than the sum of its proper divisors (9165616).

18331226 is an equidigital number, since it uses as much as digits as its factorization.

18331226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9165615.

The product of its digits is 1728, while the sum is 26.

The square root of 18331226 is about 4281.4981023002. The cubic root of 18331226 is about 263.6718930461.

The spelling of 18331226 in words is "eighteen million, three hundred thirty-one thousand, two hundred twenty-six".