13278749 has 4 divisors (see below), whose sum is σ = 14485920. Its totient is φ = 12071580.

The previous prime is 13278737. The next prime is 13278791. The reversal of 13278749 is 94787231.

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 13278749 - 2⁸ = 13278493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13278709) 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, 603569 + ... + 603590.

It is an arithmetic number, because the mean of its divisors is an integer number (3621480).

Almost surely, 2^13278749 is an apocalyptic number.

It is an amenable number.

13278749 is a deficient number, since it is larger than the sum of its proper divisors (1207171).

13278749 is a wasteful number, since it uses less digits than its factorization.

13278749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1207170.

The product of its digits is 84672, while the sum is 41.

The square root of 13278749 is about 3644.0017837537. The cubic root of 13278749 is about 236.8021933101.

The spelling of 13278749 in words is "thirteen million, two hundred seventy-eight thousand, seven hundred forty-nine".