135869 has 4 divisors (see below), whose sum is σ = 143040. Its totient is φ = 128700.

The previous prime is 135859. The next prime is 135887. The reversal of 135869 is 968531.

135869 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 968531 = 181 ⋅5351.

It is a cyclic number.

It is not a de Polignac number, because 135869 - 2⁸ = 135613 is a prime.

It is a super-2 number, since 2×135869² = 36920770322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135829) 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, 3557 + ... + 3594.

It is an arithmetic number, because the mean of its divisors is an integer number (35760).

2¹³⁵⁸⁶⁹ is an apocalyptic number.

135869 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

135869 is a deficient number, since it is larger than the sum of its proper divisors (7171).

135869 is an equidigital number, since it uses as much as digits as its factorization.

135869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7170.

The product of its digits is 6480, while the sum is 32.

The square root of 135869 is about 368.6041236883. The cubic root of 135869 is about 51.4091148476.

The spelling of 135869 in words is "one hundred thirty-five thousand, eight hundred sixty-nine".