135857243 has 4 divisors (see below), whose sum is σ = 136421208. Its totient is φ = 135293280.

The previous prime is 135857233. The next prime is 135857261. The reversal of 135857243 is 342758531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 342758531 = 743 ⋅461317.

It is a cyclic number.

It is not a de Polignac number, because 135857243 - 2¹⁰ = 135856219 is a prime.

It is a super-2 number, since 2×135857243² = 36914380951122098, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 135857197 and 135857206.

It is not an unprimeable number, because it can be changed into a prime (135857233) 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, 281621 + ... + 282102.

It is an arithmetic number, because the mean of its divisors is an integer number (34105302).

Almost surely, 2^135857243 is an apocalyptic number.

135857243 is a deficient number, since it is larger than the sum of its proper divisors (563965).

135857243 is an equidigital number, since it uses as much as digits as its factorization.

135857243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 563964.

The product of its digits is 100800, while the sum is 38.

The square root of 135857243 is about 11655.7815267789. The cubic root of 135857243 is about 514.0763196237.

The spelling of 135857243 in words is "one hundred thirty-five million, eight hundred fifty-seven thousand, two hundred forty-three".