3923391 has 8 divisors (see below), whose sum is σ = 5400064. Its totient is φ = 2531160.

The previous prime is 3923357. The next prime is 3923399. The reversal of 3923391 is 1933293.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3923391 - 2⁷ = 3923263 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 (3923399) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21001 + ... + 21186.

It is an arithmetic number, because the mean of its divisors is an integer number (675008).

Almost surely, 2^3923391 is an apocalyptic number.

3923391 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

3923391 is a deficient number, since it is larger than the sum of its proper divisors (1476673).

3923391 is a wasteful number, since it uses less digits than its factorization.

3923391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42221.

The product of its digits is 4374, while the sum is 30.

The square root of 3923391 is about 1980.7551590240. The cubic root of 3923391 is about 157.7201557127.

The spelling of 3923391 in words is "three million, nine hundred twenty-three thousand, three hundred ninety-one".