3945239 has 4 divisors (see below), whose sum is σ = 3992856. Its totient is φ = 3897624.

The previous prime is 3945233. The next prime is 3945287. The reversal of 3945239 is 9325493.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9325493 = 653 ⋅14281.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3945239 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3945199 and 3945208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3945233) 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, 23684 + ... + 23849.

It is an arithmetic number, because the mean of its divisors is an integer number (998214).

Almost surely, 2^3945239 is an apocalyptic number.

3945239 is a deficient number, since it is larger than the sum of its proper divisors (47617).

3945239 is an equidigital number, since it uses as much as digits as its factorization.

3945239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47616.

The product of its digits is 29160, while the sum is 35.

The square root of 3945239 is about 1986.2625707595. The cubic root of 3945239 is about 158.0123768545.

The spelling of 3945239 in words is "three million, nine hundred forty-five thousand, two hundred thirty-nine".