135868 has 6 divisors (see below), whose sum is σ = 237776. Its totient is φ = 67932.

The previous prime is 135859. The next prime is 135887. The reversal of 135868 is 868531.

It is a super-2 number, since 2×135868² = 36920226848, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16980 + ... + 16987.

2¹³⁵⁸⁶⁸ is an apocalyptic number.

It is an amenable number.

135868 is a deficient number, since it is larger than the sum of its proper divisors (101908).

135868 is a wasteful number, since it uses less digits than its factorization.

135868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33971 (or 33969 counting only the distinct ones).

The product of its digits is 5760, while the sum is 31.

The square root of 135868 is about 368.6027672170. The cubic root of 135868 is about 51.4089887231.

The spelling of 135868 in words is "one hundred thirty-five thousand, eight hundred sixty-eight".