13878747 has 18 divisors (see below), whose sum is σ = 20438652. Its totient is φ = 9075144.

The previous prime is 13878743. The next prime is 13878751. The reversal of 13878747 is 74787831.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (13878743) and next prime (13878751).

It is not a de Polignac number, because 13878747 - 2² = 13878743 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (13878743) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 31108 + ... + 31550.

Almost surely, 2^13878747 is an apocalyptic number.

13878747 is a deficient number, since it is larger than the sum of its proper divisors (6559905).

13878747 is an equidigital number, since it uses as much as digits as its factorization.

13878747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 567 (or 505 counting only the distinct ones).

The product of its digits is 263424, while the sum is 45.

The square root of 13878747 is about 3725.4190368333. The cubic root of 13878747 is about 240.3164055979.

The spelling of 13878747 in words is "thirteen million, eight hundred seventy-eight thousand, seven hundred forty-seven".