16438939 has 6 divisors (see below), whose sum is σ = 18069380. Its totient is φ = 14944380.

The previous prime is 16438931. The next prime is 16438967. The reversal of 16438939 is 93983461.

It is not a de Polignac number, because 16438939 - 2³ = 16438931 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16438895 and 16438904.

It is not an unprimeable number, because it can be changed into a prime (16438931) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 67809 + ... + 68050.

Almost surely, 2^16438939 is an apocalyptic number.

16438939 is a deficient number, since it is larger than the sum of its proper divisors (1630441).

16438939 is a wasteful number, since it uses less digits than its factorization.

16438939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135881 (or 135870 counting only the distinct ones).

The product of its digits is 139968, while the sum is 43.

The square root of 16438939 is about 4054.4961462554. The cubic root of 16438939 is about 254.2677390490.

The spelling of 16438939 in words is "sixteen million, four hundred thirty-eight thousand, nine hundred thirty-nine".