13780487 has 4 divisors (see below), whose sum is σ = 15749136. Its totient is φ = 11811840.

The previous prime is 13780471. The next prime is 13780537. The reversal of 13780487 is 78408731.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13780487 - 2⁴ = 13780471 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13780487.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13780457) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 984314 + ... + 984327.

It is an arithmetic number, because the mean of its divisors is an integer number (3937284).

Almost surely, 2^13780487 is an apocalyptic number.

13780487 is a deficient number, since it is larger than the sum of its proper divisors (1968649).

13780487 is an equidigital number, since it uses as much as digits as its factorization.

13780487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1968648.

The product of its (nonzero) digits is 37632, while the sum is 38.

The square root of 13780487 is about 3712.2078336214. The cubic root of 13780487 is about 239.7479239905.

The spelling of 13780487 in words is "thirteen million, seven hundred eighty thousand, four hundred eighty-seven".