18354389 has 2 divisors, whose sum is σ = 18354390. Its totient is φ = 18354388.

The previous prime is 18354383. The next prime is 18354433. The reversal of 18354389 is 98345381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11764900 + 6589489 = 3430^2 + 2567^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18354389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18354383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9177194 + 9177195.

It is an arithmetic number, because the mean of its divisors is an integer number (9177195).

Almost surely, 2^18354389 is an apocalyptic number.

It is an amenable number.

18354389 is a deficient number, since it is larger than the sum of its proper divisors (1).

18354389 is an equidigital number, since it uses as much as digits as its factorization.

18354389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 103680, while the sum is 41.

The square root of 18354389 is about 4284.2022594644. The cubic root of 18354389 is about 263.7829032871.

The spelling of 18354389 in words is "eighteen million, three hundred fifty-four thousand, three hundred eighty-nine".