18226393 has 2 divisors, whose sum is σ = 18226394. Its totient is φ = 18226392.

The previous prime is 18226387. The next prime is 18226409. The reversal of 18226393 is 39362281.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18088009 + 138384 = 4253^2 + 372^2 .

It is a cyclic number.

It is not a de Polignac number, because 18226393 - 2⁵ = 18226361 is a prime.

It is equal to p_1164796 and since 18226393 and 1164796 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (18226093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9113196 + 9113197.

It is an arithmetic number, because the mean of its divisors is an integer number (9113197).

Almost surely, 2^18226393 is an apocalyptic number.

It is an amenable number.

18226393 is a deficient number, since it is larger than the sum of its proper divisors (1).

18226393 is an equidigital number, since it uses as much as digits as its factorization.

18226393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 34.

The square root of 18226393 is about 4269.2379882129. The cubic root of 18226393 is about 263.1683010530.

The spelling of 18226393 in words is "eighteen million, two hundred twenty-six thousand, three hundred ninety-three".