16849989 has 24 divisors (see below), whose sum is σ = 26557440. Its totient is φ = 10232352.

The previous prime is 16849949. The next prime is 16849999. The reversal of 16849989 is 98994861.

It is a de Polignac number, because none of the positive numbers 2^k-16849989 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16849909) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8332 + ... + 10154.

It is an arithmetic number, because the mean of its divisors is an integer number (1106560).

Almost surely, 2^16849989 is an apocalyptic number.

It is an amenable number.

16849989 is a deficient number, since it is larger than the sum of its proper divisors (9707451).

16849989 is a wasteful number, since it uses less digits than its factorization.

16849989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1921 (or 1918 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 54.

The square root of 16849989 is about 4104.8738104843. The cubic root of 16849989 is about 256.3696087268.

The spelling of 16849989 in words is "sixteen million, eight hundred forty-nine thousand, nine hundred eighty-nine".