199638087 has 8 divisors (see below), whose sum is σ = 290382720. Its totient is φ = 120992760.

The previous prime is 199638083. The next prime is 199638133. The reversal of 199638087 is 780836991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 199638087 - 2² = 199638083 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199638083) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3024787 + ... + 3024852.

It is an arithmetic number, because the mean of its divisors is an integer number (36297840).

Almost surely, 2^199638087 is an apocalyptic number.

199638087 is a deficient number, since it is larger than the sum of its proper divisors (90744633).

199638087 is a wasteful number, since it uses less digits than its factorization.

199638087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6049653.

The product of its (nonzero) digits is 653184, while the sum is 51.

The square root of 199638087 is about 14129.3342730647. The cubic root of 199638087 is about 584.4505879785.

The spelling of 199638087 in words is "one hundred ninety-nine million, six hundred thirty-eight thousand, eighty-seven".