13783681 has 4 divisors (see below), whose sum is σ = 13837572. Its totient is φ = 13729792.

The previous prime is 13783663. The next prime is 13783699. The reversal of 13783681 is 18638731.

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

It is an interprime number because it is at equal distance from previous prime (13783663) and next prime (13783699).

It can be written as a sum of positive squares in 2 ways, for example, as 8761600 + 5022081 = 2960^2 + 2241^2 .

It is a cyclic number.

It is not a de Polignac number, because 13783681 - 2⁹ = 13783169 is a prime.

It is a super-2 number, since 2×13783681² = 379979723819522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13783681.

It is not an unprimeable number, because it can be changed into a prime (13783631) 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, 26560 + ... + 27073.

It is an arithmetic number, because the mean of its divisors is an integer number (3459393).

Almost surely, 2^13783681 is an apocalyptic number.

It is an amenable number.

13783681 is a deficient number, since it is larger than the sum of its proper divisors (53891).

13783681 is an equidigital number, since it uses as much as digits as its factorization.

13783681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53890.

The product of its digits is 24192, while the sum is 37.

The square root of 13783681 is about 3712.6380109028. The cubic root of 13783681 is about 239.7664452448.

The spelling of 13783681 in words is "thirteen million, seven hundred eighty-three thousand, six hundred eighty-one".