13278747 has 4 divisors (see below), whose sum is σ = 17705000. Its totient is φ = 8852496.

The previous prime is 13278737. The next prime is 13278791. The reversal of 13278747 is 74787231.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 13278747 - 2⁷ = 13278619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13278737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2213122 + ... + 2213127.

It is an arithmetic number, because the mean of its divisors is an integer number (4426250).

Almost surely, 2^13278747 is an apocalyptic number.

13278747 is a deficient number, since it is larger than the sum of its proper divisors (4426253).

13278747 is an equidigital number, since it uses as much as digits as its factorization.

13278747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4426252.

The product of its digits is 65856, while the sum is 39.

The square root of 13278747 is about 3644.0015093301. The cubic root of 13278747 is about 236.8021814213.

The spelling of 13278747 in words is "thirteen million, two hundred seventy-eight thousand, seven hundred forty-seven".