16973639 has 4 divisors (see below), whose sum is σ = 17432424. Its totient is φ = 16514856.

The previous prime is 16973611. The next prime is 16973653. The reversal of 16973639 is 93637961.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93637961 = 43 ⋅2177627.

It is a cyclic number.

It is not a de Polignac number, because 16973639 - 2¹² = 16969543 is a prime.

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 16973639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16973689) 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, 229337 + ... + 229410.

It is an arithmetic number, because the mean of its divisors is an integer number (4358106).

Almost surely, 2^16973639 is an apocalyptic number.

16973639 is a deficient number, since it is larger than the sum of its proper divisors (458785).

16973639 is an equidigital number, since it uses as much as digits as its factorization.

16973639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 458784.

The product of its digits is 183708, while the sum is 44.

The square root of 16973639 is about 4119.9076445959. The cubic root of 16973639 is about 256.9951853025.

The spelling of 16973639 in words is "sixteen million, nine hundred seventy-three thousand, six hundred thirty-nine".