13778343 has 12 divisors (see below), whose sum is σ = 20639528. Its totient is φ = 9185400.

The previous prime is 13778339. The next prime is 13778351. The reversal of 13778343 is 34387731.

It is not a de Polignac number, because 13778343 - 2² = 13778339 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13778298 and 13778307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13778333) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28108 + ... + 28593.

Almost surely, 2^13778343 is an apocalyptic number.

13778343 is a deficient number, since it is larger than the sum of its proper divisors (6861185).

13778343 is an frugal number, since it uses more digits than its factorization.

13778343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56716 (or 56704 counting only the distinct ones).

The product of its digits is 42336, while the sum is 36.

The square root of 13778343 is about 3711.9190454534. The cubic root of 13778343 is about 239.7354898336.

The spelling of 13778343 in words is "thirteen million, seven hundred seventy-eight thousand, three hundred forty-three".