135599399 has 4 divisors (see below), whose sum is σ = 146030136. Its totient is φ = 125168664.

The previous prime is 135599393. The next prime is 135599407. The reversal of 135599399 is 993995531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 993995531 = 23 ⋅43217197.

It is a cyclic number.

It is not a de Polignac number, because 135599399 - 2⁴ = 135599383 is a prime.

It is a super-2 number, since 2×135599399² = 36774394018322402, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 135599399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135599393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5215349 + ... + 5215374.

It is an arithmetic number, because the mean of its divisors is an integer number (36507534).

Almost surely, 2^135599399 is an apocalyptic number.

135599399 is a deficient number, since it is larger than the sum of its proper divisors (10430737).

135599399 is a wasteful number, since it uses less digits than its factorization.

135599399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10430736.

The product of its digits is 1476225, while the sum is 53.

The square root of 135599399 is about 11644.7154967393. The cubic root of 135599399 is about 513.7508911645.

The spelling of 135599399 in words is "one hundred thirty-five million, five hundred ninety-nine thousand, three hundred ninety-nine".