3942391 has 4 divisors (see below), whose sum is σ = 3969000. Its totient is φ = 3915784.

The previous prime is 3942383. The next prime is 3942397. The reversal of 3942391 is 1932493.

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 3942391 - 2³ = 3942383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3942397) 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, 13081 + ... + 13378.

It is an arithmetic number, because the mean of its divisors is an integer number (992250).

Almost surely, 2^3942391 is an apocalyptic number.

3942391 is a deficient number, since it is larger than the sum of its proper divisors (26609).

3942391 is a wasteful number, since it uses less digits than its factorization.

3942391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26608.

The product of its digits is 5832, while the sum is 31.

The square root of 3942391 is about 1985.5455169802. The cubic root of 3942391 is about 157.9743455650.

The spelling of 3942391 in words is "three million, nine hundred forty-two thousand, three hundred ninety-one".