195279640 has 32 divisors (see below), whose sum is σ = 439966080. Its totient is φ = 78007552.

The previous prime is 195279631. The next prime is 195279647. The reversal of 195279640 is 46972591.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (195279647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31692 + ... + 37348.

It is an arithmetic number, because the mean of its divisors is an integer number (13748940).

Almost surely, 2^195279640 is an apocalyptic number.

195279640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

195279640 is an abundant number, since it is smaller than the sum of its proper divisors (244686440).

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

195279640 is a wasteful number, since it uses less digits than its factorization.

195279640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6531 (or 6527 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 43.

The square root of 195279640 is about 13974.2491748215. The cubic root of 195279640 is about 580.1660642201.

The spelling of 195279640 in words is "one hundred ninety-five million, two hundred seventy-nine thousand, six hundred forty".