195139540 has 12 divisors (see below), whose sum is σ = 409793076. Its totient is φ = 78055808.

The previous prime is 195139523. The next prime is 195139561. The reversal of 195139540 is 45931591.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 95179536 + 99960004 = 9756^2 + 9998^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 195139540.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4878469 + ... + 4878508.

It is an arithmetic number, because the mean of its divisors is an integer number (34149423).

Almost surely, 2^195139540 is an apocalyptic number.

195139540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

195139540 is an abundant number, since it is smaller than the sum of its proper divisors (214653536).

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

195139540 is a wasteful number, since it uses less digits than its factorization.

195139540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9756986 (or 9756984 counting only the distinct ones).

The product of its (nonzero) digits is 24300, while the sum is 37.

The square root of 195139540 is about 13969.2354837335. The cubic root of 195139540 is about 580.0272876579.

The spelling of 195139540 in words is "one hundred ninety-five million, one hundred thirty-nine thousand, five hundred forty".