13781023 has 4 divisors (see below), whose sum is σ = 14506360. Its totient is φ = 13055688.

The previous prime is 13780993. The next prime is 13781039. The reversal of 13781023 is 32018731.

13781023 is digitally balanced in base 3, 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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13781023 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13781063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 362640 + ... + 362677.

It is an arithmetic number, because the mean of its divisors is an integer number (3626590).

Almost surely, 2^13781023 is an apocalyptic number.

13781023 is a deficient number, since it is larger than the sum of its proper divisors (725337).

13781023 is an equidigital number, since it uses as much as digits as its factorization.

13781023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 725336.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 13781023 is about 3712.2800271531. The cubic root of 13781023 is about 239.7510323281.

Adding to 13781023 its reverse (32018731), we get a palindrome (45799754).

It can be divided in two parts, 1378 and 1023, that added together give a 4-th power (2401 = 7⁴).

The spelling of 13781023 in words is "thirteen million, seven hundred eighty-one thousand, twenty-three".