16989963 has 4 divisors (see below), whose sum is σ = 22653288. Its totient is φ = 11326640.

The previous prime is 16989943. The next prime is 16989967. The reversal of 16989963 is 36998961.

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 16989963 - 2¹⁸ = 16727819 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16989967) 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, 2831658 + ... + 2831663.

It is an arithmetic number, because the mean of its divisors is an integer number (5663322).

Almost surely, 2^16989963 is an apocalyptic number.

16989963 is a deficient number, since it is larger than the sum of its proper divisors (5663325).

16989963 is an equidigital number, since it uses as much as digits as its factorization.

16989963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5663324.

The product of its digits is 629856, while the sum is 51.

The square root of 16989963 is about 4121.8882808732. Note that the first 3 decimals coincide. The cubic root of 16989963 is about 257.0775452735.

The spelling of 16989963 in words is "sixteen million, nine hundred eighty-nine thousand, nine hundred sixty-three".