13781146 has 8 divisors (see below), whose sum is σ = 20803860. Its totient is φ = 6846528.

The previous prime is 13781129. The next prime is 13781149. The reversal of 13781146 is 64118731.

It can be written as a sum of positive squares in 2 ways, for example, as 13402921 + 378225 = 3661^2 + 615^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (13781149) 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, 21631 + ... + 22258.

Almost surely, 2^13781146 is an apocalyptic number.

13781146 is a deficient number, since it is larger than the sum of its proper divisors (7022714).

13781146 is a wasteful number, since it uses less digits than its factorization.

13781146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44048.

The product of its digits is 4032, while the sum is 31.

The square root of 13781146 is about 3712.2965937543. The cubic root of 13781146 is about 239.7517456107.

Adding to 13781146 its reverse (64118731), we get a palindrome (77899877).

The spelling of 13781146 in words is "thirteen million, seven hundred eighty-one thousand, one hundred forty-six".