3942889 has 2 divisors, whose sum is σ = 3942890. Its totient is φ = 3942888.

The previous prime is 3942871. The next prime is 3942907. The reversal of 3942889 is 9882493.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (3942871) and next prime (3942907).

It can be written as a sum of positive squares in only one way, i.e., 2585664 + 1357225 = 1608^2 + 1165^2 .

It is a cyclic number.

It is not a de Polignac number, because 3942889 - 2⁹ = 3942377 is a prime.

It is not a weakly prime, because it can be changed into another prime (3942839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1971444 + 1971445.

It is an arithmetic number, because the mean of its divisors is an integer number (1971445).

Almost surely, 2^3942889 is an apocalyptic number.

It is an amenable number.

3942889 is a deficient number, since it is larger than the sum of its proper divisors (1).

3942889 is an equidigital number, since it uses as much as digits as its factorization.

3942889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 124416, while the sum is 43.

The square root of 3942889 is about 1985.6709193620. The cubic root of 3942889 is about 157.9809970202.

The spelling of 3942889 in words is "three million, nine hundred forty-two thousand, eight hundred eighty-nine".