3945906 has 12 divisors (see below), whose sum is σ = 8549502. Its totient is φ = 1315296.

The previous prime is 3945883. The next prime is 3945913. The reversal of 3945906 is 6095493.

It can be written as a sum of positive squares in only one way, i.e., 3861225 + 84681 = 1965^2 + 291^2 .

It is a Curzon number.

It is a plaindrome in base 11.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 109591 + ... + 109626.

Almost surely, 2^3945906 is an apocalyptic number.

3945906 is an abundant number, since it is smaller than the sum of its proper divisors (4603596).

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

3945906 is a wasteful number, since it uses less digits than its factorization.

3945906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219225 (or 219222 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 36.

The square root of 3945906 is about 1986.4304669432. The cubic root of 3945906 is about 158.0212811158.

It can be divided in two parts, 3945 and 906, that added together give a triangular number (4851 = T₉₈).

The spelling of 3945906 in words is "three million, nine hundred forty-five thousand, nine hundred six".