16428691 has 4 divisors (see below), whose sum is σ = 16443000. Its totient is φ = 16414384.

The previous prime is 16428679. The next prime is 16428701. The reversal of 16428691 is 19682461.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16428691 - 2⁷ = 16428563 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16428691.

It is not an unprimeable number, because it can be changed into a prime (16428611) 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, 5266 + ... + 7783.

It is an arithmetic number, because the mean of its divisors is an integer number (4110750).

Almost surely, 2^16428691 is an apocalyptic number.

16428691 is a deficient number, since it is larger than the sum of its proper divisors (14309).

16428691 is a wasteful number, since it uses less digits than its factorization.

16428691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14308.

The product of its digits is 20736, while the sum is 37.

The square root of 16428691 is about 4053.2321670489. The cubic root of 16428691 is about 254.2148914078.

The spelling of 16428691 in words is "sixteen million, four hundred twenty-eight thousand, six hundred ninety-one".