16640339 has 4 divisors (see below), whose sum is σ = 17363856. Its totient is φ = 15916824.

The previous prime is 16640329. The next prime is 16640347. The reversal of 16640339 is 93304661.

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: 93304661 = 9239 ⋅10099.

It is a cyclic number.

It is not a de Polignac number, because 16640339 - 2⁸ = 16640083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16640329) 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, 361724 + ... + 361769.

It is an arithmetic number, because the mean of its divisors is an integer number (4340964).

Almost surely, 2^16640339 is an apocalyptic number.

16640339 is a deficient number, since it is larger than the sum of its proper divisors (723517).

16640339 is an equidigital number, since it uses as much as digits as its factorization.

16640339 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 723516.

The product of its (nonzero) digits is 11664, while the sum is 32.

The square root of 16640339 is about 4079.2571627687. The cubic root of 16640339 is about 255.3019056517.

The spelling of 16640339 in words is "sixteen million, six hundred forty thousand, three hundred thirty-nine".