13781379 has 8 divisors (see below), whose sum is σ = 18392400. Its totient is φ = 9178976.

The previous prime is 13781363. The next prime is 13781381. The reversal of 13781379 is 97318731.

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 13781379 - 2⁴ = 13781363 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13781359) 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, 4669 + ... + 7025.

It is an arithmetic number, because the mean of its divisors is an integer number (2299050).

Almost surely, 2^13781379 is an apocalyptic number.

13781379 is a deficient number, since it is larger than the sum of its proper divisors (4611021).

13781379 is a wasteful number, since it uses less digits than its factorization.

13781379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4309.

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

The square root of 13781379 is about 3712.3279758125. The cubic root of 13781379 is about 239.7530967765.

The spelling of 13781379 in words is "thirteen million, seven hundred eighty-one thousand, three hundred seventy-nine".