13827978 has 12 divisors (see below), whose sum is σ = 29960658. Its totient is φ = 4609320.

The previous prime is 13827977. The next prime is 13828039. The reversal of 13827978 is 87972831.

It can be written as a sum of positive squares in only one way, i.e., 11675889 + 2152089 = 3417^2 + 1467^2 .

It is not an unprimeable number, because it can be changed into a prime (13827971) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 384093 + ... + 384128.

Almost surely, 2^13827978 is an apocalyptic number.

13827978 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

13827978 is an abundant number, since it is smaller than the sum of its proper divisors (16132680).

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

13827978 is a wasteful number, since it uses less digits than its factorization.

13827978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 768229 (or 768226 counting only the distinct ones).

The product of its digits is 169344, while the sum is 45.

The square root of 13827978 is about 3718.5989297046. The cubic root of 13827978 is about 240.0230186255.

The spelling of 13827978 in words is "thirteen million, eight hundred twenty-seven thousand, nine hundred seventy-eight".