3920861 has 4 divisors (see below), whose sum is σ = 4480992. Its totient is φ = 3360732.

The previous prime is 3920857. The next prime is 3920867. The reversal of 3920861 is 1680293.

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.

It is a cyclic number.

It is not a de Polignac number, because 3920861 - 2² = 3920857 is a prime.

It is a Duffinian number.

It is a plaindrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3920867) 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, 280055 + ... + 280068.

It is an arithmetic number, because the mean of its divisors is an integer number (1120248).

Almost surely, 2^3920861 is an apocalyptic number.

It is an amenable number.

3920861 is a deficient number, since it is larger than the sum of its proper divisors (560131).

3920861 is an equidigital number, since it uses as much as digits as its factorization.

3920861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 560130.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 3920861 is about 1980.1164107193. The cubic root of 3920861 is about 157.6862464578.

The spelling of 3920861 in words is "three million, nine hundred twenty thousand, eight hundred sixty-one".