135639973 has 16 divisors (see below), whose sum is σ = 160792576. Its totient is φ = 111967920.

The previous prime is 135639971. The next prime is 135639983. The reversal of 135639973 is 379936531.

It is a cyclic number.

It is not a de Polignac number, because 135639973 - 2¹ = 135639971 is a prime.

It is a super-4 number, since 4×135639973⁴ (a number of 34 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135639971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46990 + ... + 49792.

It is an arithmetic number, because the mean of its divisors is an integer number (10049536).

Almost surely, 2^135639973 is an apocalyptic number.

It is an amenable number.

135639973 is a deficient number, since it is larger than the sum of its proper divisors (25152603).

135639973 is a wasteful number, since it uses less digits than its factorization.

135639973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3064.

The product of its digits is 459270, while the sum is 46.

The square root of 135639973 is about 11646.4575300818. The cubic root of 135639973 is about 513.8021275026.

The spelling of 135639973 in words is "one hundred thirty-five million, six hundred thirty-nine thousand, nine hundred seventy-three".