3900989 has 2 divisors, whose sum is σ = 3900990. Its totient is φ = 3900988.

The previous prime is 3900943. The next prime is 3901013. The reversal of 3900989 is 9890093.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3705625 + 195364 = 1925^2 + 442^2 .

It is a cyclic number.

It is not a de Polignac number, because 3900989 - 2⁸ = 3900733 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3900929) 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 as a sum of consecutive naturals, namely, 1950494 + 1950495.

It is an arithmetic number, because the mean of its divisors is an integer number (1950495).

Almost surely, 2^3900989 is an apocalyptic number.

It is an amenable number.

3900989 is a deficient number, since it is larger than the sum of its proper divisors (1).

3900989 is an equidigital number, since it uses as much as digits as its factorization.

3900989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17496, while the sum is 38.

The square root of 3900989 is about 1975.0921497490. The cubic root of 3900989 is about 157.4193960621.

The spelling of 3900989 in words is "three million, nine hundred thousand, nine hundred eighty-nine".