135856 has 20 divisors (see below), whose sum is σ = 301072. Its totient is φ = 58176.

The previous prime is 135851. The next prime is 135859. The reversal of 135856 is 658531.

135856 = 49² + 50² + ... + 80².

It is a Harshad number since it is a multiple of its sum of digits (28).

It is not an unprimeable number, because it can be changed into a prime (135851) by changing a digit.

135856 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 495 + ... + 718.

2¹³⁵⁸⁵⁶ is an apocalyptic number.

135856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

135856 is an abundant number, since it is smaller than the sum of its proper divisors (165216).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

135856 is a wasteful number, since it uses less digits than its factorization.

135856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1228 (or 1222 counting only the distinct ones).

The product of its digits is 3600, while the sum is 28.

The square root of 135856 is about 368.5864891718. The cubic root of 135856 is about 51.4074751804.

The spelling of 135856 in words is "one hundred thirty-five thousand, eight hundred fifty-six".