16749865 has 16 divisors (see below), whose sum is σ = 22882176. Its totient is φ = 11651200.

The previous prime is 16749857. The next prime is 16749869. The reversal of 16749865 is 56894761.

It is not a de Polignac number, because 16749865 - 2³ = 16749857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16749869) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5356 + ... + 7885.

It is an arithmetic number, because the mean of its divisors is an integer number (1430136).

Almost surely, 2^16749865 is an apocalyptic number.

It is an amenable number.

16749865 is a deficient number, since it is larger than the sum of its proper divisors (6132311).

16749865 is a wasteful number, since it uses less digits than its factorization.

16749865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13280.

The product of its digits is 362880, while the sum is 46.

The square root of 16749865 is about 4092.6598930280. The cubic root of 16749865 is about 255.8608099547.

Subtracting 16749865 from its reverse (56894761), we obtain a square (40144896 = 6336²).

The spelling of 16749865 in words is "sixteen million, seven hundred forty-nine thousand, eight hundred sixty-five".