195980990 has 16 divisors (see below), whose sum is σ = 353209248. Its totient is φ = 78293856.

The previous prime is 195980989. The next prime is 195981017. The reversal of 195980990 is 99089591.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3677 + ... + 20136.

It is an arithmetic number, because the mean of its divisors is an integer number (22075578).

Almost surely, 2^195980990 is an apocalyptic number.

195980990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

195980990 is a deficient number, since it is larger than the sum of its proper divisors (157228258).

195980990 is a wasteful number, since it uses less digits than its factorization.

195980990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24643.

The product of its (nonzero) digits is 262440, while the sum is 50.

The square root of 195980990 is about 13999.3210549655. The cubic root of 195980990 is about 580.8597929844.

The spelling of 195980990 in words is "one hundred ninety-five million, nine hundred eighty thousand, nine hundred ninety".