135212440 has 32 divisors (see below), whose sum is σ = 331886160. Its totient is φ = 49168000.

The previous prime is 135212431. The next prime is 135212443. The reversal of 135212440 is 44212531.

It is a super-3 number, since 3×135212440³ (a number of 25 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135212443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 153211 + ... + 154090.

Almost surely, 2^135212440 is an apocalyptic number.

135212440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

135212440 is an abundant number, since it is smaller than the sum of its proper divisors (196673720).

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

135212440 is a wasteful number, since it uses less digits than its factorization.

135212440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307323 (or 307319 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 135212440 is about 11628.0884069567. The cubic root of 135212440 is about 513.2617298601.

Adding to 135212440 its reverse (44212531), we get a palindrome (179424971).

Subtracting from 135212440 its reverse (44212531), we obtain a palindrome (90999909).

The spelling of 135212440 in words is "one hundred thirty-five million, two hundred twelve thousand, four hundred forty".