3920805 has 48 divisors (see below), whose sum is σ = 8072064. Its totient is φ = 1788480.

The previous prime is 3920797. The next prime is 3920843. The reversal of 3920805 is 5080293.

It is not a de Polignac number, because 3920805 - 2³ = 3920797 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8275 + ... + 8735.

It is an arithmetic number, because the mean of its divisors is an integer number (168168).

Almost surely, 2^3920805 is an apocalyptic number.

3920805 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

3920805 is an abundant number, since it is smaller than the sum of its proper divisors (4151259).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3920805 is an equidigital number, since it uses as much as digits as its factorization.

3920805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488 (or 476 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 3920805 is about 1980.1022700861. The cubic root of 3920805 is about 157.6854957322.

The spelling of 3920805 in words is "three million, nine hundred twenty thousand, eight hundred five".