195987904 has 28 divisors (see below), whose sum is σ = 444473584. Its totient is φ = 83994624.

The previous prime is 195987901. The next prime is 195987919. The reversal of 195987904 is 409789591.

It is a tau number, because it is divible by the number of its divisors (28).

It is a super-2 number, since 2×195987904² = 76822517028626432, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (195987901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 218289 + ... + 219184.

Almost surely, 2^195987904 is an apocalyptic number.

195987904 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

195987904 is an abundant number, since it is smaller than the sum of its proper divisors (248485680).

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

195987904 is an equidigital number, since it uses as much as digits as its factorization.

195987904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437492 (or 437482 counting only the distinct ones).

The product of its (nonzero) digits is 816480, while the sum is 52.

The square root of 195987904 is about 13999.5679933347. The cubic root of 195987904 is about 580.8666236085.

The spelling of 195987904 in words is "one hundred ninety-five million, nine hundred eighty-seven thousand, nine hundred four".