13783779 has 12 divisors (see below), whose sum is σ = 20373496. Its totient is φ = 8975232.

The previous prime is 13783771. The next prime is 13783789. The reversal of 13783779 is 97738731.

13783779 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13783779 - 2³ = 13783771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13783771) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17422 + ... + 18195.

Almost surely, 2^13783779 is an apocalyptic number.

13783779 is a deficient number, since it is larger than the sum of its proper divisors (6589717).

13783779 is a wasteful number, since it uses less digits than its factorization.

13783779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35666 (or 35663 counting only the distinct ones).

The product of its digits is 222264, while the sum is 45.

The square root of 13783779 is about 3712.6512090419. The cubic root of 13783779 is about 239.7670134785.

The spelling of 13783779 in words is "thirteen million, seven hundred eighty-three thousand, seven hundred seventy-nine".