4391939 has 4 divisors (see below), whose sum is σ = 4464000. Its totient is φ = 4319880.

The previous prime is 4391929. The next prime is 4391941. The reversal of 4391939 is 9391934.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 4391939 - 2⁴ = 4391923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4391909) 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, 35939 + ... + 36060.

It is an arithmetic number, because the mean of its divisors is an integer number (1116000).

Almost surely, 2^4391939 is an apocalyptic number.

4391939 is a deficient number, since it is larger than the sum of its proper divisors (72061).

4391939 is an equidigital number, since it uses as much as digits as its factorization.

4391939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72060.

The product of its digits is 26244, while the sum is 38.

The square root of 4391939 is about 2095.6953499972. The cubic root of 4391939 is about 163.7641240269.

The spelling of 4391939 in words is "four million, three hundred ninety-one thousand, nine hundred thirty-nine".