16391963 has 8 divisors (see below), whose sum is σ = 19338240. Its totient is φ = 13596840.

The previous prime is 16391941. The next prime is 16391971. The reversal of 16391963 is 36919361.

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

It is a cyclic number.

It is not a de Polignac number, because 16391963 - 2⁸ = 16391707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16391563) 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, 37553 + ... + 37986.

It is an arithmetic number, because the mean of its divisors is an integer number (2417280).

Almost surely, 2^16391963 is an apocalyptic number.

16391963 is a deficient number, since it is larger than the sum of its proper divisors (2946277).

16391963 is an equidigital number, since it uses as much as digits as its factorization.

16391963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75577.

The product of its digits is 26244, while the sum is 38.

The square root of 16391963 is about 4048.6989268159. The cubic root of 16391963 is about 254.0253090287.

The spelling of 16391963 in words is "sixteen million, three hundred ninety-one thousand, nine hundred sixty-three".