3811820 has 12 divisors (see below), whose sum is σ = 8004864. Its totient is φ = 1524720.

The previous prime is 3811817. The next prime is 3811877. The reversal of 3811820 is 281183.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95276 + ... + 95315.

It is an arithmetic number, because the mean of its divisors is an integer number (667072).

Almost surely, 2^3811820 is an apocalyptic number.

It is an amenable number.

3811820 is an abundant number, since it is smaller than the sum of its proper divisors (4193044).

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

3811820 is a wasteful number, since it uses less digits than its factorization.

3811820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190600 (or 190598 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 3811820 is about 1952.3882810548. The cubic root of 3811820 is about 156.2107058524.

The spelling of 3811820 in words is "three million, eight hundred eleven thousand, eight hundred twenty".