3905406 has 12 divisors (see below), whose sum is σ = 8461752. Its totient is φ = 1301796.

The previous prime is 3905383. The next prime is 3905413. The reversal of 3905406 is 6045093.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 3905406.

It is a congruent number.

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, 108466 + ... + 108501.

It is an arithmetic number, because the mean of its divisors is an integer number (705146).

Almost surely, 2^3905406 is an apocalyptic number.

3905406 is an abundant number, since it is smaller than the sum of its proper divisors (4556346).

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

3905406 is a wasteful number, since it uses less digits than its factorization.

3905406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216975 (or 216972 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 3905406 is about 1976.2100090830. The cubic root of 3905406 is about 157.4787877706.

The spelling of 3905406 in words is "three million, nine hundred five thousand, four hundred six".