16890891 has 8 divisors (see below), whose sum is σ = 22569024. Its totient is φ = 11236680.

The previous prime is 16890859. The next prime is 16890917. The reversal of 16890891 is 19809861.

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

It is not a de Polignac number, because 16890891 - 2⁵ = 16890859 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16890191) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4261 + ... + 7206.

It is an arithmetic number, because the mean of its divisors is an integer number (2821128).

Almost surely, 2^16890891 is an apocalyptic number.

16890891 is a deficient number, since it is larger than the sum of its proper divisors (5678133).

16890891 is a wasteful number, since it uses less digits than its factorization.

16890891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11961.

The product of its (nonzero) digits is 31104, while the sum is 42.

The square root of 16890891 is about 4109.8529170762. The cubic root of 16890891 is about 256.5768800094.

The spelling of 16890891 in words is "sixteen million, eight hundred ninety thousand, eight hundred ninety-one".