3205861 has 4 divisors (see below), whose sum is σ = 3231232. Its totient is φ = 3180492.

The previous prime is 3205859. The next prime is 3205871. The reversal of 3205861 is 1685023.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1685023 = 17 ⋅99119.

It is a cyclic number.

It is not a de Polignac number, because 3205861 - 2¹ = 3205859 is a prime.

It is a Duffinian number.

3205861 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3205871) 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, 12495 + ... + 12748.

It is an arithmetic number, because the mean of its divisors is an integer number (807808).

Almost surely, 2^3205861 is an apocalyptic number.

It is an amenable number.

3205861 is a deficient number, since it is larger than the sum of its proper divisors (25371).

3205861 is a wasteful number, since it uses less digits than its factorization.

3205861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25370.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 3205861 is about 1790.4918318719. The cubic root of 3205861 is about 147.4511721939.

The spelling of 3205861 in words is "three million, two hundred five thousand, eight hundred sixty-one".