135885639 has 4 divisors (see below), whose sum is σ = 181180856. Its totient is φ = 90590424.

The previous prime is 135885611. The next prime is 135885647. The reversal of 135885639 is 936588531.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 135885639 - 2¹¹ = 135883591 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 (135885689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22647604 + ... + 22647609.

It is an arithmetic number, because the mean of its divisors is an integer number (45295214).

Almost surely, 2^135885639 is an apocalyptic number.

135885639 is a deficient number, since it is larger than the sum of its proper divisors (45295217).

135885639 is an equidigital number, since it uses as much as digits as its factorization.

135885639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45295216.

The product of its digits is 777600, while the sum is 48.

The square root of 135885639 is about 11656.9995710732. Note that the first 3 decimals coincide. The cubic root of 135885639 is about 514.1121334282.

The spelling of 135885639 in words is "one hundred thirty-five million, eight hundred eighty-five thousand, six hundred thirty-nine".