13987242 has 20 divisors (see below), whose sum is σ = 31342146. Its totient is φ = 4662360.

The previous prime is 13987241. The next prime is 13987271. The reversal of 13987242 is 24278931.

It can be written as a sum of positive squares in only one way, i.e., 13024881 + 962361 = 3609^2 + 981^2 .

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 13987197 and 13987206.

It is not an unprimeable number, because it can be changed into a prime (13987241) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 43009 + ... + 43332.

Almost surely, 2^13987242 is an apocalyptic number.

13987242 is an abundant number, since it is smaller than the sum of its proper divisors (17354904).

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

13987242 is an equidigital number, since it uses as much as digits as its factorization.

13987242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86355 (or 86346 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 13987242 is about 3739.9521387312. The cubic root of 13987242 is about 240.9409932271.

The spelling of 13987242 in words is "thirteen million, nine hundred eighty-seven thousand, two hundred forty-two".