195139946 has 4 divisors (see below), whose sum is σ = 292709922. Its totient is φ = 97569972.

The previous prime is 195139943. The next prime is 195139999. The reversal of 195139946 is 649931591.

It is a happy number.

195139946 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 649931591 = 113 ⋅5751607.

It can be written as a sum of positive squares in only one way, i.e., 193905625 + 1234321 = 13925^2 + 1111^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 195139946.

It is not an unprimeable number, because it can be changed into a prime (195139943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48784985 + ... + 48784988.

Almost surely, 2^195139946 is an apocalyptic number.

195139946 is a deficient number, since it is larger than the sum of its proper divisors (97569976).

195139946 is an equidigital number, since it uses as much as digits as its factorization.

195139946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97569975.

The product of its digits is 262440, while the sum is 47.

The square root of 195139946 is about 13969.2500156594. The cubic root of 195139946 is about 580.0276899186.

The spelling of 195139946 in words is "one hundred ninety-five million, one hundred thirty-nine thousand, nine hundred forty-six".