135520440 has 64 divisors (see below), whose sum is σ = 443525760. Its totient is φ = 32853120.

The previous prime is 135520433. The next prime is 135520453. The reversal of 135520440 is 44025531.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 135520440.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 50014 + ... + 52653.

It is an arithmetic number, because the mean of its divisors is an integer number (6930090).

Almost surely, 2^135520440 is an apocalyptic number.

135520440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

135520440 is an abundant number, since it is smaller than the sum of its proper divisors (308005320).

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

135520440 is a wasteful number, since it uses less digits than its factorization.

135520440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102692 (or 102688 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 135520440 is about 11641.3246668925. The cubic root of 135520440 is about 513.6511534245.

Adding to 135520440 its reverse (44025531), we get a palindrome (179545971).

The spelling of 135520440 in words is "one hundred thirty-five million, five hundred twenty thousand, four hundred forty".