16978433 has 4 divisors (see below), whose sum is σ = 17100720. Its totient is φ = 16856148.

The previous prime is 16978411. The next prime is 16978459. The reversal of 16978433 is 33487961.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16978433 - 2⁸ = 16978177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16978033) 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, 60935 + ... + 61212.

It is an arithmetic number, because the mean of its divisors is an integer number (4275180).

Almost surely, 2^16978433 is an apocalyptic number.

It is an amenable number.

16978433 is a deficient number, since it is larger than the sum of its proper divisors (122287).

16978433 is a wasteful number, since it uses less digits than its factorization.

16978433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122286.

The product of its digits is 108864, while the sum is 41.

The square root of 16978433 is about 4120.4894126790. The cubic root of 16978433 is about 257.0193780904.

The spelling of 16978433 in words is "sixteen million, nine hundred seventy-eight thousand, four hundred thirty-three".