3990241 has 2 divisors, whose sum is σ = 3990242. Its totient is φ = 3990240.

The previous prime is 3990187. The next prime is 3990251. The reversal of 3990241 is 1420993.

It is a happy number.

It is the 816-th star number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3744225 + 246016 = 1935^2 + 496^2 .

It is a cyclic number.

It is not a de Polignac number, because 3990241 - 2⁷ = 3990113 is a prime.

It is not a weakly prime, because it can be changed into another prime (3990251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1995120 + 1995121.

It is an arithmetic number, because the mean of its divisors is an integer number (1995121).

Almost surely, 2^3990241 is an apocalyptic number.

It is an amenable number.

3990241 is a deficient number, since it is larger than the sum of its proper divisors (1).

3990241 is an equidigital number, since it uses as much as digits as its factorization.

3990241 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 3990241 is about 1997.5587600869. The cubic root of 3990241 is about 158.6109046769.

The spelling of 3990241 in words is "three million, nine hundred ninety thousand, two hundred forty-one".