16994391 has 4 divisors (see below), whose sum is σ = 22659192. Its totient is φ = 11329592.

The previous prime is 16994387. The next prime is 16994413. The reversal of 16994391 is 19349961.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16994391 - 2² = 16994387 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16994371) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2832396 + ... + 2832401.

It is an arithmetic number, because the mean of its divisors is an integer number (5664798).

Almost surely, 2^16994391 is an apocalyptic number.

16994391 is a deficient number, since it is larger than the sum of its proper divisors (5664801).

16994391 is an equidigital number, since it uses as much as digits as its factorization.

16994391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5664800.

The product of its digits is 52488, while the sum is 42.

The square root of 16994391 is about 4122.4253783422. The cubic root of 16994391 is about 257.0998768993.

The spelling of 16994391 in words is "sixteen million, nine hundred ninety-four thousand, three hundred ninety-one".