13778913 has 8 divisors (see below), whose sum is σ = 18593568. Its totient is φ = 9075104.

The previous prime is 13778903. The next prime is 13778917. The reversal of 13778913 is 31987731.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 13778913 - 2⁸ = 13778657 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13778917) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27420 + ... + 27917.

It is an arithmetic number, because the mean of its divisors is an integer number (2324196).

Almost surely, 2^13778913 is an apocalyptic number.

It is an amenable number.

13778913 is a deficient number, since it is larger than the sum of its proper divisors (4814655).

13778913 is an equidigital number, since it uses as much as digits as its factorization.

13778913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55423.

The product of its digits is 31752, while the sum is 39.

The square root of 13778913 is about 3711.9958243511. The cubic root of 13778913 is about 239.7387956822.

The spelling of 13778913 in words is "thirteen million, seven hundred seventy-eight thousand, nine hundred thirteen".