3981906 has 32 divisors (see below), whose sum is σ = 9316800. Its totient is φ = 1257120.

The previous prime is 3981899. The next prime is 3981911. The reversal of 3981906 is 6091893.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 915 + ... + 2966.

It is an arithmetic number, because the mean of its divisors is an integer number (291150).

Almost surely, 2^3981906 is an apocalyptic number.

3981906 is an abundant number, since it is smaller than the sum of its proper divisors (5334894).

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

3981906 is a wasteful number, since it uses less digits than its factorization.

3981906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3911 (or 3905 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 3981906 is about 1995.4713728841. The cubic root of 3981906 is about 158.5003897598.

It can be divided in two parts, 398 and 1906, that added together give a square (2304 = 48²).

The spelling of 3981906 in words is "three million, nine hundred eighty-one thousand, nine hundred six".