13987863 has 16 divisors (see below), whose sum is σ = 20959200. Its totient is φ = 9218880.

The previous prime is 13987843. The next prime is 13987877. The reversal of 13987863 is 36878931.

It is a happy number.

13987863 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13987863 - 2¹³ = 13979671 is a prime.

It is a super-2 number, since 2×13987863² = 391320622613538, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13987843) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 508 + ... + 5313.

It is an arithmetic number, because the mean of its divisors is an integer number (1309950).

Almost surely, 2^13987863 is an apocalyptic number.

13987863 is a deficient number, since it is larger than the sum of its proper divisors (6971337).

13987863 is an equidigital number, since it uses as much as digits as its factorization.

13987863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5919 (or 5913 counting only the distinct ones).

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

The square root of 13987863 is about 3740.0351602625. The cubic root of 13987863 is about 240.9445589084.

It can be divided in two parts, 1398 and 7863, that added together give a cube (9261 = 21³).

The spelling of 13987863 in words is "thirteen million, nine hundred eighty-seven thousand, eight hundred sixty-three".