16593989 has 4 divisors (see below), whose sum is σ = 17570124. Its totient is φ = 15617856.

The previous prime is 16593979. The next prime is 16594007. The reversal of 16593989 is 98939561.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4656964 + 11937025 = 2158^2 + 3455^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16593989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16593949) 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, 488042 + ... + 488075.

It is an arithmetic number, because the mean of its divisors is an integer number (4392531).

Almost surely, 2^16593989 is an apocalyptic number.

It is an amenable number.

16593989 is a deficient number, since it is larger than the sum of its proper divisors (976135).

16593989 is an equidigital number, since it uses as much as digits as its factorization.

16593989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 976134.

The product of its digits is 524880, while the sum is 50.

The square root of 16593989 is about 4073.5720197389. The cubic root of 16593989 is about 255.0646459194.

The spelling of 16593989 in words is "sixteen million, five hundred ninety-three thousand, nine hundred eighty-nine".