13781789 has 12 divisors (see below), whose sum is σ = 16156764. Its totient is φ = 11721024.

The previous prime is 13781777. The next prime is 13781827. The reversal of 13781789 is 98718731.

13781789 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 7606564 + 6175225 = 2758^2 + 2485^2 .

It is not a de Polignac number, because 13781789 - 2⁸ = 13781533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13781759) 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, 5687 + ... + 7739.

It is an arithmetic number, because the mean of its divisors is an integer number (1346397).

Almost surely, 2^13781789 is an apocalyptic number.

It is an amenable number.

13781789 is a deficient number, since it is larger than the sum of its proper divisors (2374975).

13781789 is a wasteful number, since it uses less digits than its factorization.

13781789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2204 (or 2197 counting only the distinct ones).

The product of its digits is 84672, while the sum is 44.

The square root of 13781789 is about 3712.3831968158. The cubic root of 13781789 is about 239.7554743276.

The spelling of 13781789 in words is "thirteen million, seven hundred eighty-one thousand, seven hundred eighty-nine".