135247440 has 80 divisors (see below), whose sum is σ = 423062208. Its totient is φ = 35739648.

The previous prime is 135247439. The next prime is 135247531. The reversal of 135247440 is 44742531.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 135247398 and 135247407.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24627 + ... + 29613.

Almost surely, 2^135247440 is an apocalyptic number.

135247440 is a gapful number since it is divisible by the number (10) 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 135247440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (211531104).

135247440 is an abundant number, since it is smaller than the sum of its proper divisors (287814768).

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

135247440 is a wasteful number, since it uses less digits than its factorization.

135247440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5116 (or 5110 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 30.

The square root of 135247440 is about 11629.5932860956. The cubic root of 135247440 is about 513.3060123013.

Adding to 135247440 its reverse (44742531), we get a palindrome (179989971).

The spelling of 135247440 in words is "one hundred thirty-five million, two hundred forty-seven thousand, four hundred forty".