13780913 has 4 divisors (see below), whose sum is σ = 13788528. Its totient is φ = 13773300.

The previous prime is 13780903. The next prime is 13780919. The reversal of 13780913 is 31908731.

13780913 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 31908731 = 331 ⋅96401.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13780913 is a prime.

It is a super-2 number, since 2×13780913² = 379827126227138, 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 13780913.

It is not an unprimeable number, because it can be changed into a prime (13780919) 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, 638 + ... + 5288.

It is an arithmetic number, because the mean of its divisors is an integer number (3447132).

Almost surely, 2^13780913 is an apocalyptic number.

It is an amenable number.

13780913 is a deficient number, since it is larger than the sum of its proper divisors (7615).

13780913 is an equidigital number, since it uses as much as digits as its factorization.

13780913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7614.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 13780913 is about 3712.2652114309. The cubic root of 13780913 is about 239.7503944296.

The spelling of 13780913 in words is "thirteen million, seven hundred eighty thousand, nine hundred thirteen".