13378781 has 8 divisors (see below), whose sum is σ = 14652960. Its totient is φ = 12139632.

The previous prime is 13378777. The next prime is 13378787. The reversal of 13378781 is 18787331.

13378781 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

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 13378781 - 2² = 13378777 is a prime.

It is a super-2 number, since 2×13378781² = 357983562091922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13378787) 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, 7955 + ... + 9488.

It is an arithmetic number, because the mean of its divisors is an integer number (1831620).

Almost surely, 2^13378781 is an apocalyptic number.

It is an amenable number.

13378781 is a deficient number, since it is larger than the sum of its proper divisors (1274179).

13378781 is a wasteful number, since it uses less digits than its factorization.

13378781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17515.

The product of its digits is 28224, while the sum is 38.

The square root of 13378781 is about 3657.7016007324. The cubic root of 13378781 is about 237.3953355994.

The spelling of 13378781 in words is "thirteen million, three hundred seventy-eight thousand, seven hundred eighty-one".