3891231 has 6 divisors (see below), whose sum is σ = 5620680. Its totient is φ = 2594148.

The previous prime is 3891229. The next prime is 3891241. The reversal of 3891231 is 1321983.

It is not a de Polignac number, because 3891231 - 2¹ = 3891229 is a prime.

It is a super-2 number, since 2×3891231² = 30283357390722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 3891195 and 3891204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3891241) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 216171 + ... + 216188.

It is an arithmetic number, because the mean of its divisors is an integer number (936780).

Almost surely, 2^3891231 is an apocalyptic number.

3891231 is a deficient number, since it is larger than the sum of its proper divisors (1729449).

3891231 is a wasteful number, since it uses less digits than its factorization.

3891231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432365 (or 432362 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 3891231 is about 1972.6203385345. The cubic root of 3891231 is about 157.2880292850.

The spelling of 3891231 in words is "three million, eight hundred ninety-one thousand, two hundred thirty-one".