13978280 has 32 divisors (see below), whose sum is σ = 31989600. Its totient is φ = 5495616.

The previous prime is 13978271. The next prime is 13978297. The reversal of 13978280 is 8287931.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 602 + ... + 5321.

It is an arithmetic number, because the mean of its divisors is an integer number (999675).

Almost surely, 2^13978280 is an apocalyptic number.

13978280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13978280 is an abundant number, since it is smaller than the sum of its proper divisors (18011320).

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

13978280 is a wasteful number, since it uses less digits than its factorization.

13978280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5993 (or 5989 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 13978280 is about 3738.7538030740. The cubic root of 13978280 is about 240.8895231202.

The spelling of 13978280 in words is "thirteen million, nine hundred seventy-eight thousand, two hundred eighty".