3990726 has 12 divisors (see below), whose sum is σ = 8646612. Its totient is φ = 1330236.

The previous prime is 3990689. The next prime is 3990731. The reversal of 3990726 is 6270993.

It is a Curzon number.

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, 110836 + ... + 110871.

It is an arithmetic number, because the mean of its divisors is an integer number (720551).

Almost surely, 2^3990726 is an apocalyptic number.

3990726 is an abundant number, since it is smaller than the sum of its proper divisors (4655886).

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

3990726 is a wasteful number, since it uses less digits than its factorization.

3990726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221715 (or 221712 counting only the distinct ones).

The product of its (nonzero) digits is 20412, while the sum is 36.

The square root of 3990726 is about 1997.6801545793. The cubic root of 3990726 is about 158.6173306190.

The spelling of 3990726 in words is "three million, nine hundred ninety thousand, seven hundred twenty-six".