18223426 has 16 divisors (see below), whose sum is σ = 30454200. Its totient is φ = 8120448.

The previous prime is 18223423. The next prime is 18223433. The reversal of 18223426 is 62432281.

It can be written as a sum of positive squares in 4 ways, for example, as 17015625 + 1207801 = 4125^2 + 1099^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18223394 and 18223403.

It is not an unprimeable number, because it can be changed into a prime (18223421) 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, 11331 + ... + 12838.

Almost surely, 2^18223426 is an apocalyptic number.

18223426 is a deficient number, since it is larger than the sum of its proper divisors (12230774).

18223426 is a wasteful number, since it uses less digits than its factorization.

18223426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24213.

The product of its digits is 4608, while the sum is 28.

The square root of 18223426 is about 4268.8904881714. The cubic root of 18223426 is about 263.1540202475.

The spelling of 18223426 in words is "eighteen million, two hundred twenty-three thousand, four hundred twenty-six".