195780957 has 4 divisors (see below), whose sum is σ = 261041280. Its totient is φ = 130520636.

The previous prime is 195780931. The next prime is 195780979. The reversal of 195780957 is 759087591.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 759087591 = 3 ⋅253029197.

It is a cyclic number.

It is not a de Polignac number, because 195780957 - 2¹¹ = 195778909 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (195780757) 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, 32630157 + ... + 32630162.

It is an arithmetic number, because the mean of its divisors is an integer number (65260320).

Almost surely, 2^195780957 is an apocalyptic number.

It is an amenable number.

195780957 is a deficient number, since it is larger than the sum of its proper divisors (65260323).

195780957 is an equidigital number, since it uses as much as digits as its factorization.

195780957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65260322.

The product of its (nonzero) digits is 793800, while the sum is 51.

The square root of 195780957 is about 13992.1748488218. The cubic root of 195780957 is about 580.6621025851.

The spelling of 195780957 in words is "one hundred ninety-five million, seven hundred eighty thousand, nine hundred fifty-seven".