13781273 has 4 divisors (see below), whose sum is σ = 15034128. Its totient is φ = 12528420.

The previous prime is 13781263. The next prime is 13781291. The reversal of 13781273 is 37218731.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13781273 - 2²⁰ = 12732697 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 8.

It is not an unprimeable number, because it can be changed into a prime (13781233) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 626411 + ... + 626432.

It is an arithmetic number, because the mean of its divisors is an integer number (3758532).

Almost surely, 2^13781273 is an apocalyptic number.

It is an amenable number.

13781273 is a deficient number, since it is larger than the sum of its proper divisors (1252855).

13781273 is a wasteful number, since it uses less digits than its factorization.

13781273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1252854.

The product of its digits is 7056, while the sum is 32.

The square root of 13781273 is about 3712.3136990292. The cubic root of 13781273 is about 239.7524820849.

The spelling of 13781273 in words is "thirteen million, seven hundred eighty-one thousand, two hundred seventy-three".