16609749 has 16 divisors (see below), whose sum is σ = 24888192. Its totient is φ = 9776448.

The previous prime is 16609741. The next prime is 16609759. The reversal of 16609749 is 94790661.

It is not a de Polignac number, because 16609749 - 2³ = 16609741 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16609749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16609741) 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, 8362 + ... + 10155.

It is an arithmetic number, because the mean of its divisors is an integer number (1555512).

Almost surely, 2^16609749 is an apocalyptic number.

It is an amenable number.

16609749 is a deficient number, since it is larger than the sum of its proper divisors (8278443).

16609749 is a wasteful number, since it uses less digits than its factorization.

16609749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18556.

The product of its (nonzero) digits is 81648, while the sum is 42.

The square root of 16609749 is about 4075.5059808569. The cubic root of 16609749 is about 255.1453688626.

The spelling of 16609749 in words is "sixteen million, six hundred nine thousand, seven hundred forty-nine".