199638914 has 4 divisors (see below), whose sum is σ = 299458374. Its totient is φ = 99819456.

The previous prime is 199638877. The next prime is 199638917. The reversal of 199638914 is 419836991.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 168558289 + 31080625 = 12983^2 + 5575^2 .

It is not an unprimeable number, because it can be changed into a prime (199638917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49909727 + ... + 49909730.

Almost surely, 2^199638914 is an apocalyptic number.

199638914 is a deficient number, since it is larger than the sum of its proper divisors (99819460).

199638914 is an equidigital number, since it uses as much as digits as its factorization.

199638914 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99819459.

The product of its digits is 419904, while the sum is 50.

The square root of 199638914 is about 14129.3635383905. The cubic root of 199638914 is about 584.4513950055.

The spelling of 199638914 in words is "one hundred ninety-nine million, six hundred thirty-eight thousand, nine hundred fourteen".