195138258 has 16 divisors (see below), whose sum is σ = 446030400. Its totient is φ = 55753776.

The previous prime is 195138253. The next prime is 195138287. The reversal of 195138258 is 852831591.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 4646149 = 195138258 / (1 + 9 + 5 + 1 + 3 + 8 + 2 + 5 + 8).

It is not an unprimeable number, because it can be changed into a prime (195138253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2323033 + ... + 2323116.

It is an arithmetic number, because the mean of its divisors is an integer number (27876900).

Almost surely, 2^195138258 is an apocalyptic number.

195138258 is an abundant number, since it is smaller than the sum of its proper divisors (250892142).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

195138258 is a wasteful number, since it uses less digits than its factorization.

195138258 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4646161.

The product of its digits is 86400, while the sum is 42.

The square root of 195138258 is about 13969.1895971098. The cubic root of 195138258 is about 580.0260174615.

The spelling of 195138258 in words is "one hundred ninety-five million, one hundred thirty-eight thousand, two hundred fifty-eight".