3909239 has 4 divisors (see below), whose sum is σ = 3935280. Its totient is φ = 3883200.

The previous prime is 3909233. The next prime is 3909247. The reversal of 3909239 is 9329093.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9329093 = 647 ⋅14419.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3909239 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3909199 and 3909208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3909233) 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, 12794 + ... + 13095.

It is an arithmetic number, because the mean of its divisors is an integer number (983820).

Almost surely, 2^3909239 is an apocalyptic number.

3909239 is a deficient number, since it is larger than the sum of its proper divisors (26041).

3909239 is a wasteful number, since it uses less digits than its factorization.

3909239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26040.

The product of its (nonzero) digits is 13122, while the sum is 35.

The square root of 3909239 is about 1977.1795568435. The cubic root of 3909239 is about 157.5302906383.

The spelling of 3909239 in words is "three million, nine hundred nine thousand, two hundred thirty-nine".