135447381 has 24 divisors (see below), whose sum is σ = 208039104. Its totient is φ = 84624000.

The previous prime is 135447359. The next prime is 135447419. The reversal of 135447381 is 183744531.

It is a happy number.

135447381 is a `hidden beast` number, since 135 + 447 + 3 + 81 = 666.

It is not a de Polignac number, because 135447381 - 2⁵ = 135447349 is a prime.

It is a super-2 number, since 2×135447381² = 36691986039518322, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135447311) 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 23 ways as a sum of consecutive naturals, for example, 36640 + ... + 40166.

It is an arithmetic number, because the mean of its divisors is an integer number (8668296).

Almost surely, 2^135447381 is an apocalyptic number.

It is an amenable number.

135447381 is a deficient number, since it is larger than the sum of its proper divisors (72591723).

135447381 is a wasteful number, since it uses less digits than its factorization.

135447381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3801 (or 3798 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 135447381 is about 11638.1863277746. The cubic root of 135447381 is about 513.5588338078.

The spelling of 135447381 in words is "one hundred thirty-five million, four hundred forty-seven thousand, three hundred eighty-one".