135839815 has 4 divisors (see below), whose sum is σ = 163007784. Its totient is φ = 108671848.

The previous prime is 135839813. The next prime is 135839819. The reversal of 135839815 is 518938531.

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

It is a cyclic number.

It is not a de Polignac number, because 135839815 - 2¹ = 135839813 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 (135839813) 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, 13583977 + ... + 13583986.

It is an arithmetic number, because the mean of its divisors is an integer number (40751946).

Almost surely, 2^135839815 is an apocalyptic number.

135839815 is a deficient number, since it is larger than the sum of its proper divisors (27167969).

135839815 is an equidigital number, since it uses as much as digits as its factorization.

135839815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27167968.

The product of its digits is 129600, while the sum is 43.

The square root of 135839815 is about 11655.0338909846. The cubic root of 135839815 is about 514.0543364865.

The spelling of 135839815 in words is "one hundred thirty-five million, eight hundred thirty-nine thousand, eight hundred fifteen".