16891897 has 16 divisors (see below), whose sum is σ = 19723392. Its totient is φ = 14296320.

The previous prime is 16891879. The next prime is 16891921. The reversal of 16891897 is 79819861.

It is not a de Polignac number, because 16891897 - 2¹¹ = 16889849 is a prime.

It is a super-3 number, since 3×16891897³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

Its product of digits (217728) is a multiple of the sum of its prime divisors (1008).

It is a self number, because there is not a number n which added to its sum of digits gives 16891897.

It is not an unprimeable number, because it can be changed into a prime (16891097) 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, 18823 + ... + 19699.

It is an arithmetic number, because the mean of its divisors is an integer number (1232712).

Almost surely, 2^16891897 is an apocalyptic number.

16891897 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

16891897 is a deficient number, since it is larger than the sum of its proper divisors (2831495).

16891897 is a wasteful number, since it uses less digits than its factorization.

16891897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1008.

The product of its digits is 217728, while the sum is 49.

The square root of 16891897 is about 4109.9753040621. The cubic root of 16891897 is about 256.5819737059.

The spelling of 16891897 in words is "sixteen million, eight hundred ninety-one thousand, eight hundred ninety-seven".