65439889 has 2 divisors, whose sum is σ = 65439890. Its totient is φ = 65439888.

The previous prime is 65439877. The next prime is 65439893. The reversal of 65439889 is 98893456.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44782864 + 20657025 = 6692^2 + 4545^2 .

It is a cyclic number.

It is not a de Polignac number, because 65439889 - 2⁹ = 65439377 is a prime.

It is not a weakly prime, because it can be changed into another prime (65439859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32719944 + 32719945.

It is an arithmetic number, because the mean of its divisors is an integer number (32719945).

Almost surely, 2^65439889 is an apocalyptic number.

It is an amenable number.

65439889 is a deficient number, since it is larger than the sum of its proper divisors (1).

65439889 is an equidigital number, since it uses as much as digits as its factorization.

65439889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1866240, while the sum is 52.

The square root of 65439889 is about 8089.4925057138. The cubic root of 65439889 is about 402.9775492545.

The spelling of 65439889 in words is "sixty-five million, four hundred thirty-nine thousand, eight hundred eighty-nine".