13878739 has 8 divisors (see below), whose sum is σ = 16161120. Its totient is φ = 11671296.

The previous prime is 13878719. The next prime is 13878743. The reversal of 13878739 is 93787831.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13878739 - 2⁵ = 13878707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13878719) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18334 + ... + 19075.

It is an arithmetic number, because the mean of its divisors is an integer number (2020140).

Almost surely, 2^13878739 is an apocalyptic number.

13878739 is a deficient number, since it is larger than the sum of its proper divisors (2282381).

13878739 is an equidigital number, since it uses as much as digits as its factorization.

13878739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37469.

The product of its digits is 254016, while the sum is 46.

The square root of 13878739 is about 3725.4179631284. The cubic root of 13878739 is about 240.3163594235.

The spelling of 13878739 in words is "thirteen million, eight hundred seventy-eight thousand, seven hundred thirty-nine".