195139945 has 64 divisors (see below), whose sum is σ = 317915136. Its totient is φ = 111041280.

The previous prime is 195139943. The next prime is 195139999. The reversal of 195139945 is 549931591.

It is a happy number.

195139945 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 195139945 - 2¹ = 195139943 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 195139895 and 195139904.

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 in 63 ways as a sum of consecutive naturals, for example, 635482 + ... + 635788.

It is an arithmetic number, because the mean of its divisors is an integer number (4967424).

Almost surely, 2^195139945 is an apocalyptic number.

195139945 is the 6985-th decagonal number.

It is an amenable number.

195139945 is a deficient number, since it is larger than the sum of its proper divisors (122775191).

195139945 is a wasteful number, since it uses less digits than its factorization.

195139945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 470.

The product of its digits is 218700, while the sum is 46.

The square root of 195139945 is about 13969.2499798665. The cubic root of 195139945 is about 580.0276889278.

The spelling of 195139945 in words is "one hundred ninety-five million, one hundred thirty-nine thousand, nine hundred forty-five".