3990257 has 4 divisors (see below), whose sum is σ = 4224996. Its totient is φ = 3755520.

The previous prime is 3990251. The next prime is 3990269. The reversal of 3990257 is 7520993.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2972176 + 1018081 = 1724^2 + 1009^2 .

It is a cyclic number.

It is not a de Polignac number, because 3990257 - 2⁴ = 3990241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3990251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 117344 + ... + 117377.

It is an arithmetic number, because the mean of its divisors is an integer number (1056249).

Almost surely, 2^3990257 is an apocalyptic number.

It is an amenable number.

3990257 is a deficient number, since it is larger than the sum of its proper divisors (234739).

3990257 is a wasteful number, since it uses less digits than its factorization.

3990257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234738.

The product of its (nonzero) digits is 17010, while the sum is 35.

The square root of 3990257 is about 1997.5627649714. The cubic root of 3990257 is about 158.6111166751.

The spelling of 3990257 in words is "three million, nine hundred ninety thousand, two hundred fifty-seven".