16574989 has 4 divisors (see below), whose sum is σ = 16659324. Its totient is φ = 16490656.

The previous prime is 16574969. The next prime is 16574993. The reversal of 16574989 is 98947561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98947561 = 1367 ⋅72383.

It can be written as a sum of positive squares in 2 ways, for example, as 15342889 + 1232100 = 3917^2 + 1110^2 .

It is a cyclic number.

It is not a de Polignac number, because 16574989 - 2⁷ = 16574861 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 (16574959) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41872 + ... + 42265.

It is an arithmetic number, because the mean of its divisors is an integer number (4164831).

Almost surely, 2^16574989 is an apocalyptic number.

It is an amenable number.

16574989 is a deficient number, since it is larger than the sum of its proper divisors (84335).

16574989 is an equidigital number, since it uses as much as digits as its factorization.

16574989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84334.

The product of its digits is 544320, while the sum is 49.

The square root of 16574989 is about 4071.2392462247. The cubic root of 16574989 is about 254.9672596694.

The spelling of 16574989 in words is "sixteen million, five hundred seventy-four thousand, nine hundred eighty-nine".