13087840 has 24 divisors (see below), whose sum is σ = 30920400. Its totient is φ = 5235072.

The previous prime is 13087819. The next prime is 13087861. The reversal of 13087840 is 4878031.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (13087819) and next prime (13087861).

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 3 ways as a sum of consecutive naturals, for example, 40740 + ... + 41059.

It is an arithmetic number, because the mean of its divisors is an integer number (1288350).

Almost surely, 2^13087840 is an apocalyptic number.

13087840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13087840 is an abundant number, since it is smaller than the sum of its proper divisors (17832560).

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

13087840 is an equidigital number, since it uses as much as digits as its factorization.

13087840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81814 (or 81806 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 13087840 is about 3617.7119841137. The cubic root of 13087840 is about 235.6618733438.

The spelling of 13087840 in words is "thirteen million, eighty-seven thousand, eight hundred forty".