13781793 has 4 divisors (see below), whose sum is σ = 18375728. Its totient is φ = 9187860.

The previous prime is 13781777. The next prime is 13781827. The reversal of 13781793 is 39718731.

It is a happy number.

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.

It is not a de Polignac number, because 13781793 - 2⁴ = 13781777 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13781693) 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, 2296963 + ... + 2296968.

It is an arithmetic number, because the mean of its divisors is an integer number (4593932).

Almost surely, 2^13781793 is an apocalyptic number.

It is an amenable number.

13781793 is a deficient number, since it is larger than the sum of its proper divisors (4593935).

13781793 is an equidigital number, since it uses as much as digits as its factorization.

13781793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4593934.

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

The square root of 13781793 is about 3712.3837355532. The cubic root of 13781793 is about 239.7554975229.

The spelling of 13781793 in words is "thirteen million, seven hundred eighty-one thousand, seven hundred ninety-three".