16704431 has 4 divisors (see below), whose sum is σ = 16725552. Its totient is φ = 16683312.

The previous prime is 16704419. The next prime is 16704449. The reversal of 16704431 is 13440761.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13440761 = 17 ⋅790633.

It is a cyclic number.

It is not a de Polignac number, because 16704431 - 2⁶ = 16704367 is a prime.

It is a super-2 number, since 2×16704431² = 558076030067522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16704431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16704461) 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, 9326 + ... + 10971.

It is an arithmetic number, because the mean of its divisors is an integer number (4181388).

Almost surely, 2^16704431 is an apocalyptic number.

16704431 is a deficient number, since it is larger than the sum of its proper divisors (21121).

16704431 is an equidigital number, since it uses as much as digits as its factorization.

16704431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21120.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 16704431 is about 4087.1054549644. The cubic root of 16704431 is about 255.6292596975.

The spelling of 16704431 in words is "sixteen million, seven hundred four thousand, four hundred thirty-one".