199912508 has 6 divisors (see below), whose sum is σ = 349846896. Its totient is φ = 99956252.

The previous prime is 199912507. The next prime is 199912513. The reversal of 199912508 is 805219991.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199912507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24989060 + ... + 24989067.

It is an arithmetic number, because the mean of its divisors is an integer number (58307816).

Almost surely, 2^199912508 is an apocalyptic number.

It is an amenable number.

199912508 is a deficient number, since it is larger than the sum of its proper divisors (149934388).

199912508 is a wasteful number, since it uses less digits than its factorization.

199912508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49978131 (or 49978129 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 44.

The square root of 199912508 is about 14139.0419760322. The cubic root of 199912508 is about 584.7182591513.

The spelling of 199912508 in words is "one hundred ninety-nine million, nine hundred twelve thousand, five hundred eight".