135973 has 4 divisors (see below), whose sum is σ = 136800. Its totient is φ = 135148.

The previous prime is 135937. The next prime is 135977. The reversal of 135973 is 379531.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 135973 - 2⁹ = 135461 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73 + ... + 526.

It is an arithmetic number, because the mean of its divisors is an integer number (34200).

2¹³⁵⁹⁷³ is an apocalyptic number.

It is an amenable number.

135973 is a deficient number, since it is larger than the sum of its proper divisors (827).

135973 is an equidigital number, since it uses as much as digits as its factorization.

135973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 826.

The product of its digits is 2835, while the sum is 28.

The square root of 135973 is about 368.7451694599. The cubic root of 135973 is about 51.4222284211.

The spelling of 135973 in words is "one hundred thirty-five thousand, nine hundred seventy-three".