135287999 has 48 divisors (see below), whose sum is σ = 184928256. Its totient is φ = 96033600.

The previous prime is 135287993. The next prime is 135288011. The reversal of 135287999 is 999782531.

It is not a de Polignac number, because 135287999 - 2⁴ = 135287983 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 135287999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135287993) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 861629 + ... + 861785.

It is an arithmetic number, because the mean of its divisors is an integer number (3852672).

Almost surely, 2^135287999 is an apocalyptic number.

135287999 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

135287999 is a deficient number, since it is larger than the sum of its proper divisors (49640257).

135287999 is a wasteful number, since it uses less digits than its factorization.

135287999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244 (or 225 counting only the distinct ones).

The product of its digits is 1224720, while the sum is 53.

The square root of 135287999 is about 11631.3369394924. The cubic root of 135287999 is about 513.3573185041.

The spelling of 135287999 in words is "one hundred thirty-five million, two hundred eighty-seven thousand, nine hundred ninety-nine".