199638429 has 16 divisors (see below), whose sum is σ = 285708672. Its totient is φ = 123545088.

The previous prime is 199638409. The next prime is 199638431. The reversal of 199638429 is 924836991.

It is not a de Polignac number, because 199638429 - 2⁹ = 199637917 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199638409) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23089 + ... + 30534.

It is an arithmetic number, because the mean of its divisors is an integer number (17856792).

Almost surely, 2^199638429 is an apocalyptic number.

It is an amenable number.

199638429 is a deficient number, since it is larger than the sum of its proper divisors (86070243).

199638429 is a wasteful number, since it uses less digits than its factorization.

199638429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53716.

The product of its digits is 839808, while the sum is 51.

The square root of 199638429 is about 14129.3463755405. The cubic root of 199638429 is about 584.4509217191.

The spelling of 199638429 in words is "one hundred ninety-nine million, six hundred thirty-eight thousand, four hundred twenty-nine".