3891393 has 24 divisors (see below), whose sum is σ = 6402240. Its totient is φ = 2254560.

The previous prime is 3891389. The next prime is 3891403. The reversal of 3891393 is 3931983.

It is not a de Polignac number, because 3891393 - 2² = 3891389 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3891323) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1423 + ... + 3131.

It is an arithmetic number, because the mean of its divisors is an integer number (266760).

Almost surely, 2^3891393 is an apocalyptic number.

3891393 is a gapful number since it is divisible by the number (33) formed by its first and last digit.

It is an amenable number.

3891393 is a deficient number, since it is larger than the sum of its proper divisors (2510847).

3891393 is a wasteful number, since it uses less digits than its factorization.

3891393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1749 (or 1746 counting only the distinct ones).

The product of its digits is 17496, while the sum is 36.

The square root of 3891393 is about 1972.6614002408. The cubic root of 3891393 is about 157.2902119967.

The spelling of 3891393 in words is "three million, eight hundred ninety-one thousand, three hundred ninety-three".