16458989 has 2 divisors, whose sum is σ = 16458990. Its totient is φ = 16458988.

The previous prime is 16458973. The next prime is 16459021. The reversal of 16458989 is 98985461.

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., 16240900 + 218089 = 4030^2 + 467^2 .

It is a cyclic number.

It is not a de Polignac number, because 16458989 - 2⁴ = 16458973 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16458089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8229494 + 8229495.

It is an arithmetic number, because the mean of its divisors is an integer number (8229495).

Almost surely, 2^16458989 is an apocalyptic number.

It is an amenable number.

16458989 is a deficient number, since it is larger than the sum of its proper divisors (1).

16458989 is an equidigital number, since it uses as much as digits as its factorization.

16458989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 622080, while the sum is 50.

The square root of 16458989 is about 4056.9679564916. The cubic root of 16458989 is about 254.3710708785.

The spelling of 16458989 in words is "sixteen million, four hundred fifty-eight thousand, nine hundred eighty-nine".