13242840 has 96 divisors (see below), whose sum is σ = 43085520. Its totient is φ = 3254784.

The previous prime is 13242833. The next prime is 13242863. The reversal of 13242840 is 4824231.

It is a super-2 number, since 2×13242840² = 350745622531200, which contains 22 as substring.

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 13242840.

It is a congruent number.

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, 19954 + ... + 20606.

Almost surely, 2^13242840 is an apocalyptic number.

13242840 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 13242840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21542760).

13242840 is an abundant number, since it is smaller than the sum of its proper divisors (29842680).

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

13242840 is a wasteful number, since it uses less digits than its factorization.

13242840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 693 (or 676 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 13242840 is about 3639.0713101010. The cubic root of 13242840 is about 236.5885435019.

The spelling of 13242840 in words is "thirteen million, two hundred forty-two thousand, eight hundred forty".