13991234 has 4 divisors (see below), whose sum is σ = 20986854. Its totient is φ = 6995616.

The previous prime is 13991233. The next prime is 13991251. The reversal of 13991234 is 43219931.

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., 7756225 + 6235009 = 2785^2 + 2497^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 13991234.

It is not an unprimeable number, because it can be changed into a prime (13991231) 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 as a sum of consecutive naturals, namely, 3497807 + ... + 3497810.

Almost surely, 2^13991234 is an apocalyptic number.

13991234 is a deficient number, since it is larger than the sum of its proper divisors (6995620).

13991234 is an equidigital number, since it uses as much as digits as its factorization.

13991234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6995619.

The product of its digits is 5832, while the sum is 32.

The square root of 13991234 is about 3740.4857973263. The cubic root of 13991234 is about 240.9639128028.

The spelling of 13991234 in words is "thirteen million, nine hundred ninety-one thousand, two hundred thirty-four".