135644427 has 12 divisors (see below), whose sum is σ = 196048320. Its totient is φ = 90375408.

The previous prime is 135644423. The next prime is 135644449. The reversal of 135644427 is 724446531.

135644427 is a `hidden beast` number, since 1 + 3 + 5 + 644 + 4 + 2 + 7 = 666.

It is not a de Polignac number, because 135644427 - 2² = 135644423 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 135644391 and 135644400.

It is not an unprimeable number, because it can be changed into a prime (135644423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16449 + ... + 23277.

It is an arithmetic number, because the mean of its divisors is an integer number (16337360).

Almost surely, 2^135644427 is an apocalyptic number.

135644427 is a deficient number, since it is larger than the sum of its proper divisors (60403893).

135644427 is a wasteful number, since it uses less digits than its factorization.

135644427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9042 (or 9039 counting only the distinct ones).

The product of its digits is 80640, while the sum is 36.

The square root of 135644427 is about 11646.6487454546. The cubic root of 135644427 is about 513.8077513355.

The spelling of 135644427 in words is "one hundred thirty-five million, six hundred forty-four thousand, four hundred twenty-seven".