3924391 has 4 divisors (see below), whose sum is σ = 3983032. Its totient is φ = 3865752.

The previous prime is 3924353. The next prime is 3924409. The reversal of 3924391 is 1934293.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3924391 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3924311) 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, 29220 + ... + 29353.

It is an arithmetic number, because the mean of its divisors is an integer number (995758).

Almost surely, 2^3924391 is an apocalyptic number.

3924391 is a deficient number, since it is larger than the sum of its proper divisors (58641).

3924391 is an equidigital number, since it uses as much as digits as its factorization.

3924391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58640.

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

The square root of 3924391 is about 1981.0075719189. The cubic root of 3924391 is about 157.7335545606.

Multiplying 3924391 by its sum of digits (31), we get a palindrome (121656121).

The spelling of 3924391 in words is "three million, nine hundred twenty-four thousand, three hundred ninety-one".