16749657 has 12 divisors (see below), whose sum is σ = 24238500. Its totient is φ = 11145888.

The previous prime is 16749647. The next prime is 16749679. The reversal of 16749657 is 75694761.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 10653696 + 6095961 = 3264^2 + 2469^2 .

It is not a de Polignac number, because 16749657 - 2⁸ = 16749401 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (16749637) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4719 + ... + 7467.

It is an arithmetic number, because the mean of its divisors is an integer number (2019875).

Almost surely, 2^16749657 is an apocalyptic number.

It is an amenable number.

16749657 is a deficient number, since it is larger than the sum of its proper divisors (7488843).

16749657 is a wasteful number, since it uses less digits than its factorization.

16749657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3432 (or 3429 counting only the distinct ones).

The product of its digits is 317520, while the sum is 45.

The square root of 16749657 is about 4092.6344816023. The cubic root of 16749657 is about 255.8597508562.

The spelling of 16749657 in words is "sixteen million, seven hundred forty-nine thousand, six hundred fifty-seven".