3205891 has 4 divisors (see below), whose sum is σ = 3452512. Its totient is φ = 2959272.

The previous prime is 3205879. The next prime is 3205897. The reversal of 3205891 is 1985023.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1985023 = 31 ⋅64033.

It is a cyclic number.

It is not a de Polignac number, because 3205891 - 2⁵ = 3205859 is a prime.

It is the 1791-st Hogben number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3205897) by changing a digit.

It is a nontrivial repunit in base 1790.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123291 + ... + 123316.

It is an arithmetic number, because the mean of its divisors is an integer number (863128).

Almost surely, 2^3205891 is an apocalyptic number.

3205891 is a deficient number, since it is larger than the sum of its proper divisors (246621).

3205891 is a wasteful number, since it uses less digits than its factorization.

3205891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246620.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 3205891 is about 1790.5002094387. The cubic root of 3205891 is about 147.4516321349.

It can be divided in two parts, 3205 and 891, that added together give a 12-th power (4096 = 2¹²).

The spelling of 3205891 in words is "three million, two hundred five thousand, eight hundred ninety-one".