16704391 has 4 divisors (see below), whose sum is σ = 18222984. Its totient is φ = 15185800.

The previous prime is 16704367. The next prime is 16704397. The reversal of 16704391 is 19340761.

It is a happy number.

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 16704391 - 2⁷ = 16704263 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16704397) 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, 759280 + ... + 759301.

It is an arithmetic number, because the mean of its divisors is an integer number (4555746).

Almost surely, 2^16704391 is an apocalyptic number.

16704391 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

16704391 is a deficient number, since it is larger than the sum of its proper divisors (1518593).

16704391 is a wasteful number, since it uses less digits than its factorization.

16704391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1518592.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 16704391 is about 4087.1005615228. The cubic root of 16704391 is about 255.6290556563.

It can be divided in two parts, 16 and 704391, that added together give a palindrome (704407).

The spelling of 16704391 in words is "sixteen million, seven hundred four thousand, three hundred ninety-one".