135989421 has 8 divisors (see below), whose sum is σ = 181386624. Its totient is φ = 90625920.

The previous prime is 135989417. The next prime is 135989449. The reversal of 135989421 is 124989531.

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

It is not a de Polignac number, because 135989421 - 2² = 135989417 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135989461) 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, 3340 + ... + 16826.

It is an arithmetic number, because the mean of its divisors is an integer number (22673328).

Almost surely, 2^135989421 is an apocalyptic number.

It is an amenable number.

135989421 is a deficient number, since it is larger than the sum of its proper divisors (45397203).

135989421 is a wasteful number, since it uses less digits than its factorization.

135989421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16851.

The product of its digits is 77760, while the sum is 42.

The square root of 135989421 is about 11661.4502099867. The cubic root of 135989421 is about 514.2429836742.

The spelling of 135989421 in words is "one hundred thirty-five million, nine hundred eighty-nine thousand, four hundred twenty-one".