195139220 has 24 divisors (see below), whose sum is σ = 415409064. Its totient is φ = 76985856.

The previous prime is 195139151. The next prime is 195139229. The reversal of 195139220 is 22931591.

It can be written as a sum of positive squares in 4 ways, for example, as 145924 + 194993296 = 382^2 + 13964^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (195139229) 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, 65369 + ... + 68288.

It is an arithmetic number, because the mean of its divisors is an integer number (17308711).

Almost surely, 2^195139220 is an apocalyptic number.

195139220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

195139220 is an abundant number, since it is smaller than the sum of its proper divisors (220269844).

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

195139220 is a wasteful number, since it uses less digits than its factorization.

195139220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133739 (or 133737 counting only the distinct ones).

The product of its (nonzero) digits is 4860, while the sum is 32.

The square root of 195139220 is about 13969.2240299882. The cubic root of 195139220 is about 580.0269706047.

The spelling of 195139220 in words is "one hundred ninety-five million, one hundred thirty-nine thousand, two hundred twenty".