13387240 has 16 divisors (see below), whose sum is σ = 30121380. Its totient is φ = 5354880.

The previous prime is 13387201. The next prime is 13387249. The reversal of 13387240 is 4278331.

It can be written as a sum of positive squares in 2 ways, for example, as 12830724 + 556516 = 3582^2 + 746^2 .

It is a junction number, because it is equal to n+sod(n) for n = 13387199 and 13387208.

It is not an unprimeable number, because it can be changed into a prime (13387249) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 167301 + ... + 167380.

Almost surely, 2^13387240 is an apocalyptic number.

13387240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13387240 is an abundant number, since it is smaller than the sum of its proper divisors (16734140).

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

13387240 is a wasteful number, since it uses less digits than its factorization.

13387240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334692 (or 334688 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 13387240 is about 3658.8577452533. The cubic root of 13387240 is about 237.4453576970.

The spelling of 13387240 in words is "thirteen million, three hundred eighty-seven thousand, two hundred forty".