195621812 has 12 divisors (see below), whose sum is σ = 351590820. Its totient is φ = 95167296.

The previous prime is 195621809. The next prime is 195621841. The reversal of 195621812 is 218126591.

It can be written as a sum of positive squares in 2 ways, for example, as 77334436 + 118287376 = 8794^2 + 10876^2 .

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, 660737 + ... + 661032.

It is an arithmetic number, because the mean of its divisors is an integer number (29299235).

Almost surely, 2^195621812 is an apocalyptic number.

It is an amenable number.

195621812 is a deficient number, since it is larger than the sum of its proper divisors (155969008).

195621812 is a wasteful number, since it uses less digits than its factorization.

195621812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1321810 (or 1321808 counting only the distinct ones).

The product of its digits is 8640, while the sum is 35.

The square root of 195621812 is about 13986.4867640162. The cubic root of 195621812 is about 580.5047251395.

The spelling of 195621812 in words is "one hundred ninety-five million, six hundred twenty-one thousand, eight hundred twelve".