16971943 has 4 divisors (see below), whose sum is σ = 17042608. Its totient is φ = 16901280.

The previous prime is 16971919. The next prime is 16971949. The reversal of 16971943 is 34917961.

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 16971943 - 2⁹ = 16971431 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16971896 and 16971905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16971949) 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, 34971 + ... + 35452.

It is an arithmetic number, because the mean of its divisors is an integer number (4260652).

Almost surely, 2^16971943 is an apocalyptic number.

16971943 is a deficient number, since it is larger than the sum of its proper divisors (70665).

16971943 is an equidigital number, since it uses as much as digits as its factorization.

16971943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70664.

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

The square root of 16971943 is about 4119.7018095974. The cubic root of 16971943 is about 256.9866253947.

It can be divided in two parts, 16971 and 943, that multiplied together give a triangular number (16003653 = T₅₆₅₇).

The spelling of 16971943 in words is "sixteen million, nine hundred seventy-one thousand, nine hundred forty-three".