13387887 has 6 divisors (see below), whose sum is σ = 19338072. Its totient is φ = 8925252.

The previous prime is 13387883. The next prime is 13387897. The reversal of 13387887 is 78878331.

13387887 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13387887 - 2² = 13387883 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13387883) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 743763 + ... + 743780.

It is an arithmetic number, because the mean of its divisors is an integer number (3223012).

Almost surely, 2^13387887 is an apocalyptic number.

13387887 is a deficient number, since it is larger than the sum of its proper divisors (5950185).

13387887 is a wasteful number, since it uses less digits than its factorization.

13387887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1487549 (or 1487546 counting only the distinct ones).

The product of its digits is 225792, while the sum is 45.

The square root of 13387887 is about 3658.9461597569. The cubic root of 13387887 is about 237.4491828487.

The spelling of 13387887 in words is "thirteen million, three hundred eighty-seven thousand, eight hundred eighty-seven".