16977391 has 4 divisors (see below), whose sum is σ = 17210032. Its totient is φ = 16744752.

The previous prime is 16977379. The next prime is 16977409. The reversal of 16977391 is 19377961.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19377961 = 101 ⋅191861.

It is a cyclic number.

It is not a de Polignac number, because 16977391 - 2⁹ = 16976879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16977341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116211 + ... + 116356.

It is an arithmetic number, because the mean of its divisors is an integer number (4302508).

Almost surely, 2^16977391 is an apocalyptic number.

16977391 is a deficient number, since it is larger than the sum of its proper divisors (232641).

16977391 is an equidigital number, since it uses as much as digits as its factorization.

16977391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232640.

The product of its digits is 71442, while the sum is 43.

The square root of 16977391 is about 4120.3629694482. The cubic root of 16977391 is about 257.0141200537.

The spelling of 16977391 in words is "sixteen million, nine hundred seventy-seven thousand, three hundred ninety-one".