195923639 has 2 divisors, whose sum is σ = 195923640. Its totient is φ = 195923638.

The previous prime is 195923633. The next prime is 195923677. The reversal of 195923639 is 936329591.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-195923639 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 195923593 and 195923602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (195923633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97961819 + 97961820.

It is an arithmetic number, because the mean of its divisors is an integer number (97961820).

Almost surely, 2^195923639 is an apocalyptic number.

195923639 is a deficient number, since it is larger than the sum of its proper divisors (1).

195923639 is an equidigital number, since it uses as much as digits as its factorization.

195923639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 393660, while the sum is 47.

The square root of 195923639 is about 13997.2725557517. The cubic root of 195923639 is about 580.8031273864.

The spelling of 195923639 in words is "one hundred ninety-five million, nine hundred twenty-three thousand, six hundred thirty-nine".