13780117 has 4 divisors (see below), whose sum is σ = 14840140. Its totient is φ = 12720096.

The previous prime is 13780103. The next prime is 13780127. The reversal of 13780117 is 71108731.

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 3243601 + 10536516 = 1801^2 + 3246^2 .

It is a cyclic number.

It is not a de Polignac number, because 13780117 - 2¹⁹ = 13255829 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 (13780127) 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, 529992 + ... + 530017.

It is an arithmetic number, because the mean of its divisors is an integer number (3710035).

Almost surely, 2^13780117 is an apocalyptic number.

It is an amenable number.

13780117 is a deficient number, since it is larger than the sum of its proper divisors (1060023).

13780117 is a wasteful number, since it uses less digits than its factorization.

13780117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1060022.

The product of its (nonzero) digits is 1176, while the sum is 28.

The square root of 13780117 is about 3712.1579977151. The cubic root of 13780117 is about 239.7457782626.

Adding to 13780117 its reverse (71108731), we get a palindrome (84888848).

The spelling of 13780117 in words is "thirteen million, seven hundred eighty thousand, one hundred seventeen".