135820987 has 16 divisors (see below), whose sum is σ = 148377600. Its totient is φ = 123888960.

The previous prime is 135820981. The next prime is 135820991. The reversal of 135820987 is 789028531.

135820987 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 135820987 - 2¹¹ = 135818939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135820981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60438 + ... + 62644.

It is an arithmetic number, because the mean of its divisors is an integer number (9273600).

Almost surely, 2^135820987 is an apocalyptic number.

135820987 is a deficient number, since it is larger than the sum of its proper divisors (12556613).

135820987 is a wasteful number, since it uses less digits than its factorization.

135820987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2346.

The product of its (nonzero) digits is 120960, while the sum is 43.

The square root of 135820987 is about 11654.2261433353. The cubic root of 135820987 is about 514.0305853199.

The spelling of 135820987 in words is "one hundred thirty-five million, eight hundred twenty thousand, nine hundred eighty-seven".