135278421 has 8 divisors (see below), whose sum is σ = 180514464. Its totient is φ = 90114000.

The previous prime is 135278413. The next prime is 135278447. The reversal of 135278421 is 124872531.

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

It is not a de Polignac number, because 135278421 - 2³ = 135278413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135278411) 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 7 ways as a sum of consecutive naturals, for example, 13330 + ... + 21171.

It is an arithmetic number, because the mean of its divisors is an integer number (22564308).

Almost surely, 2^135278421 is an apocalyptic number.

It is an amenable number.

135278421 is a deficient number, since it is larger than the sum of its proper divisors (45236043).

135278421 is a wasteful number, since it uses less digits than its factorization.

135278421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35811.

The product of its digits is 13440, while the sum is 33.

The square root of 135278421 is about 11630.9251996563. The cubic root of 135278421 is about 513.3452034792.

The spelling of 135278421 in words is "one hundred thirty-five million, two hundred seventy-eight thousand, four hundred twenty-one".