13999642 has 4 divisors (see below), whose sum is σ = 20999466. Its totient is φ = 6999820.

The previous prime is 13999621. The next prime is 13999651. The reversal of 13999642 is 24699931.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 12609601 + 1390041 = 3551^2 + 1179^2 .

It is a super-2 number, since 2×13999642² = 391979952256328, which contains 22 as substring.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 3499909 + ... + 3499912.

Almost surely, 2^13999642 is an apocalyptic number.

13999642 is a deficient number, since it is larger than the sum of its proper divisors (6999824).

13999642 is an equidigital number, since it uses as much as digits as its factorization.

13999642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6999823.

The product of its digits is 104976, while the sum is 43.

The square root of 13999642 is about 3741.6095467058. The cubic root of 13999642 is about 241.0121720407.

It can be divided in two parts, 13999 and 642, that added together give a palindrome (14641).

The spelling of 13999642 in words is "thirteen million, nine hundred ninety-nine thousand, six hundred forty-two".