13999278 has 16 divisors (see below), whose sum is σ = 28336896. Its totient is φ = 4610040.

The previous prime is 13999273. The next prime is 13999289. The reversal of 13999278 is 87299931.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13999273) 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, 13558 + ... + 14553.

It is an arithmetic number, because the mean of its divisors is an integer number (1771056).

Almost surely, 2^13999278 is an apocalyptic number.

13999278 is an abundant number, since it is smaller than the sum of its proper divisors (14337618).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13999278 is a wasteful number, since it uses less digits than its factorization.

13999278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28199.

The product of its digits is 244944, while the sum is 48.

The square root of 13999278 is about 3741.5609042217. The cubic root of 13999278 is about 241.0100831970.

The spelling of 13999278 in words is "thirteen million, nine hundred ninety-nine thousand, two hundred seventy-eight".