135989443 has 4 divisors (see below), whose sum is σ = 143988840. Its totient is φ = 127990048.

The previous prime is 135989417. The next prime is 135989449. The reversal of 135989443 is 344989531.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 344989531 = 127 ⋅2716453.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-135989443 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 135989393 and 135989402.

It is not an unprimeable number, because it can be changed into a prime (135989449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3999673 + ... + 3999706.

It is an arithmetic number, because the mean of its divisors is an integer number (35997210).

Almost surely, 2^135989443 is an apocalyptic number.

135989443 is a deficient number, since it is larger than the sum of its proper divisors (7999397).

135989443 is an equidigital number, since it uses as much as digits as its factorization.

135989443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7999396.

The product of its digits is 466560, while the sum is 46.

The square root of 135989443 is about 11661.4511532656. The cubic root of 135989443 is about 514.2430114051.

The spelling of 135989443 in words is "one hundred thirty-five million, nine hundred eighty-nine thousand, four hundred forty-three".