199787965 has 16 divisors (see below), whose sum is σ = 261830016. Its totient is φ = 145454400.

The previous prime is 199787941. The next prime is 199787971. The reversal of 199787965 is 569787991.

It is not a de Polignac number, because 199787965 - 2¹³ = 199779773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17031 + ... + 26260.

It is an arithmetic number, because the mean of its divisors is an integer number (16364376).

Almost surely, 2^199787965 is an apocalyptic number.

It is an amenable number.

199787965 is a deficient number, since it is larger than the sum of its proper divisors (62042051).

199787965 is a wasteful number, since it uses less digits than its factorization.

199787965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43380.

The product of its digits is 8573040, while the sum is 61.

The square root of 199787965 is about 14134.6370664407. The cubic root of 199787965 is about 584.5968098656.

The spelling of 199787965 in words is "one hundred ninety-nine million, seven hundred eighty-seven thousand, nine hundred sixty-five".