195890239 has 4 divisors (see below), whose sum is σ = 197909824. Its totient is φ = 193870656.

The previous prime is 195890237. The next prime is 195890243. The reversal of 195890239 is 932098591.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 932098591 = 12049 ⋅77359.

It is a cyclic number.

It is not a de Polignac number, because 195890239 - 2¹ = 195890237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (195890231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1009647 + ... + 1009840.

It is an arithmetic number, because the mean of its divisors is an integer number (49477456).

Almost surely, 2^195890239 is an apocalyptic number.

195890239 is a deficient number, since it is larger than the sum of its proper divisors (2019585).

195890239 is an equidigital number, since it uses as much as digits as its factorization.

195890239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2019584.

The product of its (nonzero) digits is 174960, while the sum is 46.

The square root of 195890239 is about 13996.0794153220. The cubic root of 195890239 is about 580.7701214544.

The spelling of 195890239 in words is "one hundred ninety-five million, eight hundred ninety thousand, two hundred thirty-nine".