135420444 has 48 divisors (see below), whose sum is σ = 360589600. Its totient is φ = 43918848.

The previous prime is 135420413. The next prime is 135420449. The reversal of 135420444 is 444024531.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135420449) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12949 + ... + 20940.

Almost surely, 2^135420444 is an apocalyptic number.

It is an amenable number.

135420444 is an abundant number, since it is smaller than the sum of its proper divisors (225169156).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

135420444 is a wasteful number, since it uses less digits than its factorization.

135420444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33939 (or 33931 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 27.

The square root of 135420444 is about 11637.0290022840. The cubic root of 135420444 is about 513.5247870034.

Adding to 135420444 its reverse (444024531), we get a palindrome (579444975).

The spelling of 135420444 in words is "one hundred thirty-five million, four hundred twenty thousand, four hundred forty-four".