16909439 has 4 divisors (see below), whose sum is σ = 17644656. Its totient is φ = 16174224.

The previous prime is 16909391. The next prime is 16909447. The reversal of 16909439 is 93490961.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93490961 = 3701 ⋅25261.

It is a cyclic number.

It is not a de Polignac number, because 16909439 - 2¹⁶ = 16843903 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16909396 and 16909405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16909469) 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, 367574 + ... + 367619.

It is an arithmetic number, because the mean of its divisors is an integer number (4411164).

Almost surely, 2^16909439 is an apocalyptic number.

16909439 is a deficient number, since it is larger than the sum of its proper divisors (735217).

16909439 is an equidigital number, since it uses as much as digits as its factorization.

16909439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 735216.

The product of its (nonzero) digits is 52488, while the sum is 41.

The square root of 16909439 is about 4112.1088263809. The cubic root of 16909439 is about 256.6707619144.

The spelling of 16909439 in words is "sixteen million, nine hundred nine thousand, four hundred thirty-nine".