13395781 has 4 divisors (see below), whose sum is σ = 15309472. Its totient is φ = 11482092.

The previous prime is 13395769. The next prime is 13395787. The reversal of 13395781 is 18759331.

It is a happy number.

13395781 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 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 a cyclic number.

It is not a de Polignac number, because 13395781 - 2⁵ = 13395749 is a prime.

It is a super-2 number, since 2×13395781² = 358893897199922, 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 13395781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13395787) 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, 956835 + ... + 956848.

It is an arithmetic number, because the mean of its divisors is an integer number (3827368).

Almost surely, 2^13395781 is an apocalyptic number.

It is an amenable number.

13395781 is a deficient number, since it is larger than the sum of its proper divisors (1913691).

13395781 is an equidigital number, since it uses as much as digits as its factorization.

13395781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1913690.

The product of its digits is 22680, while the sum is 37.

The square root of 13395781 is about 3660.0247266924. The cubic root of 13395781 is about 237.4958433252.

The spelling of 13395781 in words is "thirteen million, three hundred ninety-five thousand, seven hundred eighty-one".