16891994 has 16 divisors (see below), whose sum is σ = 29308608. Its totient is φ = 7151712.

The previous prime is 16891961. The next prime is 16892009. The reversal of 16891994 is 49919861.

It is a super-2 number, since 2×16891994² = 570678922592072, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6107 + ... + 8430.

It is an arithmetic number, because the mean of its divisors is an integer number (1831788).

Almost surely, 2^16891994 is an apocalyptic number.

16891994 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

16891994 is a deficient number, since it is larger than the sum of its proper divisors (12416614).

16891994 is a wasteful number, since it uses less digits than its factorization.

16891994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14629.

The product of its digits is 139968, while the sum is 47.

The square root of 16891994 is about 4109.9871046026. The cubic root of 16891994 is about 256.5824648369.

The spelling of 16891994 in words is "sixteen million, eight hundred ninety-one thousand, nine hundred ninety-four".