13809442 has 4 divisors (see below), whose sum is σ = 20714166. Its totient is φ = 6904720.

The previous prime is 13809431. The next prime is 13809443. The reversal of 13809442 is 24490831.

13809442 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24490831 = 547 ⋅44773.

It can be written as a sum of positive squares in only one way, i.e., 9853321 + 3956121 = 3139^2 + 1989^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (13809443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3452359 + ... + 3452362.

Almost surely, 2^13809442 is an apocalyptic number.

13809442 is a deficient number, since it is larger than the sum of its proper divisors (6904724).

13809442 is an equidigital number, since it uses as much as digits as its factorization.

13809442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6904723.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 13809442 is about 3716.1057573756. The cubic root of 13809442 is about 239.9157227239.

The spelling of 13809442 in words is "thirteen million, eight hundred nine thousand, four hundred forty-two".