18458389 has 2 divisors, whose sum is σ = 18458390. Its totient is φ = 18458388.

The previous prime is 18458383. The next prime is 18458399. The reversal of 18458389 is 98385481.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18404100 + 54289 = 4290^2 + 233^2 .

It is a cyclic number.

It is not a de Polignac number, because 18458389 - 2³ = 18458381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18458381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9229194 + 9229195.

It is an arithmetic number, because the mean of its divisors is an integer number (9229195).

Almost surely, 2^18458389 is an apocalyptic number.

It is an amenable number.

18458389 is a deficient number, since it is larger than the sum of its proper divisors (1).

18458389 is an equidigital number, since it uses as much as digits as its factorization.

18458389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 276480, while the sum is 46.

The square root of 18458389 is about 4296.3227299634. The cubic root of 18458389 is about 264.2801825271.

The spelling of 18458389 in words is "eighteen million, four hundred fifty-eight thousand, three hundred eighty-nine".