239639669 has 2 divisors, whose sum is σ = 239639670. Its totient is φ = 239639668.

The previous prime is 239639657. The next prime is 239639677. The reversal of 239639669 is 966936932.

239639669 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 141372100 + 98267569 = 11890^2 + 9913^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-239639669 is a prime.

It is a super-2 number, since 2×239639669² = 114854341916859122, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 239639669.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (239639069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119819834 + 119819835.

It is an arithmetic number, because the mean of its divisors is an integer number (119819835).

Almost surely, 2^239639669 is an apocalyptic number.

It is an amenable number.

239639669 is a deficient number, since it is larger than the sum of its proper divisors (1).

239639669 is an equidigital number, since it uses as much as digits as its factorization.

239639669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2834352, while the sum is 53.

The square root of 239639669 is about 15480.2993834099. The cubic root of 239639669 is about 621.1353364700.

The spelling of 239639669 in words is "two hundred thirty-nine million, six hundred thirty-nine thousand, six hundred sixty-nine".