135523444 has 48 divisors (see below), whose sum is σ = 286375936. Its totient is φ = 54885600.

The previous prime is 135523417. The next prime is 135523459. The reversal of 135523444 is 444325531.

It is a super-2 number, since 2×135523444² = 36733207747242272, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35509 + ... + 39139.

Almost surely, 2^135523444 is an apocalyptic number.

135523444 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 135523444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (143187968).

135523444 is an abundant number, since it is smaller than the sum of its proper divisors (150852492).

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

135523444 is a wasteful number, since it uses less digits than its factorization.

135523444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3716 (or 3714 counting only the distinct ones).

The product of its digits is 28800, while the sum is 31.

The square root of 135523444 is about 11641.4536892950. The cubic root of 135523444 is about 513.6549486617.

Adding to 135523444 its reverse (444325531), we get a palindrome (579848975).

The spelling of 135523444 in words is "one hundred thirty-five million, five hundred twenty-three thousand, four hundred forty-four".