135213444 has 72 divisors (see below), whose sum is σ = 373621248. Its totient is φ = 41045760.

The previous prime is 135213431. The next prime is 135213467. The reversal of 135213444 is 444312531.

135213444 = T₉₆ + T₉₇ + ... + T₉₃₂.

It is a happy number.

135213444 is a `hidden beast` number, since 1 + 3 + 5 + 213 + 444 = 666.

135213444 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×135213444² = 36565350876682272, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15409 + ... + 22535.

It is an arithmetic number, because the mean of its divisors is an integer number (5189184).

Almost surely, 2^135213444 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 135213444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (186810624).

135213444 is an abundant number, since it is smaller than the sum of its proper divisors (238407804).

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

135213444 is a wasteful number, since it uses less digits than its factorization.

135213444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7185 (or 7180 counting only the distinct ones).

The product of its digits is 5760, while the sum is 27.

The square root of 135213444 is about 11628.1315782029. The cubic root of 135213444 is about 513.2630002401.

Adding to 135213444 its reverse (444312531), we get a palindrome (579525975).

The spelling of 135213444 in words is "one hundred thirty-five million, two hundred thirteen thousand, four hundred forty-four".