13982778 has 24 divisors (see below), whose sum is σ = 30869748. Its totient is φ = 4572672.

The previous prime is 13982777. The next prime is 13982779. The reversal of 13982778 is 87728931.

It is an interprime number because it is at equal distance from previous prime (13982777) and next prime (13982779).

It can be written as a sum of positive squares in 2 ways, for example, as 11068929 + 2913849 = 3327^2 + 1707^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13982777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6375 + ... + 8282.

Almost surely, 2^13982778 is an apocalyptic number.

13982778 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

13982778 is an abundant number, since it is smaller than the sum of its proper divisors (16886970).

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

13982778 is a wasteful number, since it uses less digits than its factorization.

13982778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14718 (or 14715 counting only the distinct ones).

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

The square root of 13982778 is about 3739.3552920256. The cubic root of 13982778 is about 240.9153585562.

The spelling of 13982778 in words is "thirteen million, nine hundred eighty-two thousand, seven hundred seventy-eight".