16891797 has 8 divisors (see below), whose sum is σ = 24254944. Its totient is φ = 10394928.

The previous prime is 16891793. The next prime is 16891799. The reversal of 16891797 is 79719861.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 16891797 - 2² = 16891793 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16891793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 216523 + ... + 216600.

It is an arithmetic number, because the mean of its divisors is an integer number (3031868).

Almost surely, 2^16891797 is an apocalyptic number.

It is an amenable number.

16891797 is a deficient number, since it is larger than the sum of its proper divisors (7363147).

16891797 is a wasteful number, since it uses less digits than its factorization.

16891797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433139.

The product of its digits is 190512, while the sum is 48.

The square root of 16891797 is about 4109.9631385208. The cubic root of 16891797 is about 256.5814673833.

It can be divided in two parts, 1689 and 1797, that added together give a triangular number (3486 = T₈₃).

The spelling of 16891797 in words is "sixteen million, eight hundred ninety-one thousand, seven hundred ninety-seven".