13781887 has 24 divisors (see below), whose sum is σ = 17014272. Its totient is φ = 11113200.

The previous prime is 13781861. The next prime is 13781891. The reversal of 13781887 is 78818731.

It is a happy number.

It is not a de Polignac number, because 13781887 - 2⁷ = 13781759 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13781827) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 65212 + ... + 65422.

It is an arithmetic number, because the mean of its divisors is an integer number (708928).

Almost surely, 2^13781887 is an apocalyptic number.

13781887 is a deficient number, since it is larger than the sum of its proper divisors (3232385).

13781887 is a wasteful number, since it uses less digits than its factorization.

13781887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299 (or 292 counting only the distinct ones).

The product of its digits is 75264, while the sum is 43.

The square root of 13781887 is about 3712.3963958608. The cubic root of 13781887 is about 239.7560426133.

The spelling of 13781887 in words is "thirteen million, seven hundred eighty-one thousand, eight hundred eighty-seven".