129438199 has 4 divisors (see below), whose sum is σ = 141205320. Its totient is φ = 117671080.

The previous prime is 129438149. The next prime is 129438209. The reversal of 129438199 is 991834921.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 129438199 - 2²¹ = 127341047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129438109) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5883544 + ... + 5883565.

It is an arithmetic number, because the mean of its divisors is an integer number (35301330).

Almost surely, 2^129438199 is an apocalyptic number.

129438199 is a deficient number, since it is larger than the sum of its proper divisors (11767121).

129438199 is a wasteful number, since it uses less digits than its factorization.

129438199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11767120.

The product of its digits is 139968, while the sum is 46.

The square root of 129438199 is about 11377.0909726520. The cubic root of 129438199 is about 505.8489123292.

It can be divided in two parts, 1294 and 38199, that added together give a palindrome (39493).

The spelling of 129438199 in words is "one hundred twenty-nine million, four hundred thirty-eight thousand, one hundred ninety-nine".