13978863 has 12 divisors (see below), whose sum is σ = 20233200. Its totient is φ = 9300096.

The previous prime is 13978849. The next prime is 13978897. The reversal of 13978863 is 36887931.

It is a happy number.

It is not a de Polignac number, because 13978863 - 2¹⁸ = 13716719 is a prime.

It is a super-2 number, since 2×13978863² = 390817221545538, which contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13978823) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4095 + ... + 6687.

It is an arithmetic number, because the mean of its divisors is an integer number (1686100).

Almost surely, 2^13978863 is an apocalyptic number.

13978863 is a deficient number, since it is larger than the sum of its proper divisors (6254337).

13978863 is a wasteful number, since it uses less digits than its factorization.

13978863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3198 (or 3195 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 13978863 is about 3738.8317694168. The cubic root of 13978863 is about 240.8928720453.

It can be divided in two parts, 13978 and 863, that added together give a palindrome (14841).

The spelling of 13978863 in words is "thirteen million, nine hundred seventy-eight thousand, eight hundred sixty-three".