13781473 has 4 divisors (see below), whose sum is σ = 13820868. Its totient is φ = 13742080.

The previous prime is 13781461. The next prime is 13781477. The reversal of 13781473 is 37418731.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9809424 + 3972049 = 3132^2 + 1993^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13781473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13781477) 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, 19168 + ... + 19873.

It is an arithmetic number, because the mean of its divisors is an integer number (3455217).

Almost surely, 2^13781473 is an apocalyptic number.

It is an amenable number.

13781473 is a deficient number, since it is larger than the sum of its proper divisors (39395).

13781473 is an equidigital number, since it uses as much as digits as its factorization.

13781473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39394.

The product of its digits is 14112, while the sum is 34.

The square root of 13781473 is about 3712.3406363102. The cubic root of 13781473 is about 239.7536418778.

The spelling of 13781473 in words is "thirteen million, seven hundred eighty-one thousand, four hundred seventy-three".