135507993 has 8 divisors (see below), whose sum is σ = 185084256. Its totient is φ = 88135200.

The previous prime is 135507979. The next prime is 135508001. The reversal of 135507993 is 399705531.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 135507993 - 2⁵ = 135507961 is a prime.

It is not an unprimeable number, because it can be changed into a prime (135507193) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 550723 + ... + 550968.

It is an arithmetic number, because the mean of its divisors is an integer number (23135532).

Almost surely, 2^135507993 is an apocalyptic number.

It is an amenable number.

135507993 is a deficient number, since it is larger than the sum of its proper divisors (49576263).

135507993 is a wasteful number, since it uses less digits than its factorization.

135507993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1101735.

The product of its (nonzero) digits is 127575, while the sum is 42.

The square root of 135507993 is about 11640.7900505077. The cubic root of 135507993 is about 513.6354273548.

The spelling of 135507993 in words is "one hundred thirty-five million, five hundred seven thousand, nine hundred ninety-three".