13878765 has 24 divisors (see below), whose sum is σ = 24204960. Its totient is φ = 7356384.

The previous prime is 13878763. The next prime is 13878779. The reversal of 13878765 is 56787831.

It is not a de Polignac number, because 13878765 - 2¹ = 13878763 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 13878765.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13878763) 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, 7194 + ... + 8916.

It is an arithmetic number, because the mean of its divisors is an integer number (1008540).

Almost surely, 2^13878765 is an apocalyptic number.

13878765 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13878765 is a deficient number, since it is larger than the sum of its proper divisors (10326195).

13878765 is a wasteful number, since it uses less digits than its factorization.

13878765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1913 (or 1910 counting only the distinct ones).

The product of its digits is 282240, while the sum is 45.

The square root of 13878765 is about 3725.4214526681. The cubic root of 13878765 is about 240.3165094904.

The spelling of 13878765 in words is "thirteen million, eight hundred seventy-eight thousand, seven hundred sixty-five".