16404589 has 4 divisors (see below), whose sum is σ = 17117856. Its totient is φ = 15691324.

The previous prime is 16404571. The next prime is 16404593. The reversal of 16404589 is 98540461.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16404589 - 2⁷ = 16404461 is a prime.

It is a super-2 number, since 2×16404589² = 538221080517842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16404529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 356599 + ... + 356644.

It is an arithmetic number, because the mean of its divisors is an integer number (4279464).

Almost surely, 2^16404589 is an apocalyptic number.

It is an amenable number.

16404589 is a deficient number, since it is larger than the sum of its proper divisors (713267).

16404589 is an equidigital number, since it uses as much as digits as its factorization.

16404589 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 713266.

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 16404589 is about 4050.2578930236. The cubic root of 16404589 is about 254.0905137557.

The spelling of 16404589 in words is "sixteen million, four hundred four thousand, five hundred eighty-nine".