135019939 has 4 divisors (see below), whose sum is σ = 136005624. Its totient is φ = 134034256.

The previous prime is 135019921. The next prime is 135019949. The reversal of 135019939 is 939910531.

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 135019939 - 2⁷ = 135019811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135019949) 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, 492637 + ... + 492910.

It is an arithmetic number, because the mean of its divisors is an integer number (34001406).

Almost surely, 2^135019939 is an apocalyptic number.

135019939 is a deficient number, since it is larger than the sum of its proper divisors (985685).

135019939 is an equidigital number, since it uses as much as digits as its factorization.

135019939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 985684.

The product of its (nonzero) digits is 32805, while the sum is 40.

The square root of 135019939 is about 11619.8080448861. The cubic root of 135019939 is about 513.0180384711.

The spelling of 135019939 in words is "one hundred thirty-five million, nineteen thousand, nine hundred thirty-nine".