16690729 has 4 divisors (see below), whose sum is σ = 18208080. Its totient is φ = 15173380.

The previous prime is 16690717. The next prime is 16690763. The reversal of 16690729 is 92709661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16690729 - 2⁵ = 16690697 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16690691 and 16690700.

It is not an unprimeable number, because it can be changed into a prime (16690789) 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, 758659 + ... + 758680.

It is an arithmetic number, because the mean of its divisors is an integer number (4552020).

Almost surely, 2^16690729 is an apocalyptic number.

It is an amenable number.

16690729 is a deficient number, since it is larger than the sum of its proper divisors (1517351).

16690729 is a wasteful number, since it uses less digits than its factorization.

16690729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1517350.

The product of its (nonzero) digits is 40824, while the sum is 40.

The square root of 16690729 is about 4085.4288636568. The cubic root of 16690729 is about 255.5593463066.

The spelling of 16690729 in words is "sixteen million, six hundred ninety thousand, seven hundred twenty-nine".