136857 has 20 divisors (see below), whose sum is σ = 224080. Its totient is φ = 74088.

The previous prime is 136849. The next prime is 136859. The reversal of 136857 is 758631.

It is not a de Polignac number, because 136857 - 2³ = 136849 is a prime.

It is a Duffinian number.

136857 is a lucky number.

It is a nialpdrome in base 7.

It is a zygodrome in base 7.

It is not an unprimeable number, because it can be changed into a prime (136859) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 7194 + ... + 7212.

It is an arithmetic number, because the mean of its divisors is an integer number (11204).

136857 is a Friedman number, since it can be written as (65-8)*7^(3+1), using all its digits and the basic arithmetic operations.

2¹³⁶⁸⁵⁷ is an apocalyptic number.

It is an amenable number.

136857 is a deficient number, since it is larger than the sum of its proper divisors (87223).

136857 is an frugal number, since it uses more digits than its factorization.

136857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50 (or 29 counting only the distinct ones).

The product of its digits is 5040, while the sum is 30.

The square root of 136857 is about 369.9418873283. The cubic root of 136857 is about 51.5334247467.

The spelling of 136857 in words is "one hundred thirty-six thousand, eight hundred fifty-seven".