16971439 has 4 divisors (see below), whose sum is σ = 17029656. Its totient is φ = 16913224.

The previous prime is 16971433. The next prime is 16971469. The reversal of 16971439 is 93417961.

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 16971439 - 2³ = 16971431 is a prime.

It is a Smith number, since the sum of its digits (40) 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 (16971431) 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, 28669 + ... + 29254.

It is an arithmetic number, because the mean of its divisors is an integer number (4257414).

Almost surely, 2^16971439 is an apocalyptic number.

16971439 is a deficient number, since it is larger than the sum of its proper divisors (58217).

16971439 is an equidigital number, since it uses as much as digits as its factorization.

16971439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58216.

The product of its digits is 40824, while the sum is 40.

The square root of 16971439 is about 4119.6406396675. The cubic root of 16971439 is about 256.9840815386.

It can be divided in two parts, 1697 and 1439, that added together give a square (3136 = 56²).

The spelling of 16971439 in words is "sixteen million, nine hundred seventy-one thousand, four hundred thirty-nine".