16940891 has 18 divisors (see below), whose sum is σ = 19904652. Its totient is φ = 14296320.

The previous prime is 16940863. The next prime is 16940893. The reversal of 16940891 is 19804961.

It is a happy number.

It is not a de Polignac number, because 16940891 - 2⁶ = 16940827 is a prime.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16940893) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 232031 + ... + 232103.

It is an arithmetic number, because the mean of its divisors is an integer number (1105814).

Almost surely, 2^16940891 is an apocalyptic number.

16940891 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

16940891 is a deficient number, since it is larger than the sum of its proper divisors (2963761).

16940891 is an equidigital number, since it uses as much as digits as its factorization.

16940891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191 (or 101 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 16940891 is about 4115.9313648311. The cubic root of 16940891 is about 256.8298014654.

The spelling of 16940891 in words is "sixteen million, nine hundred forty thousand, eight hundred ninety-one".