13720049 has 6 divisors (see below), whose sum is σ = 15960114. Its totient is φ = 11760000.

The previous prime is 13720039. The next prime is 13720061. The reversal of 13720049 is 94002731.

It can be written as a sum of positive squares in only one way, i.e., 9878449 + 3841600 = 3143^2 + 1960^2 .

It is not a de Polignac number, because 13720049 - 2⁸ = 13719793 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13720039) 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 5 ways as a sum of consecutive naturals, for example, 139952 + ... + 140049.

It is an arithmetic number, because the mean of its divisors is an integer number (2660019).

Almost surely, 2^13720049 is an apocalyptic number.

It is an amenable number.

13720049 is a deficient number, since it is larger than the sum of its proper divisors (2240065).

13720049 is an equidigital number, since it uses as much as digits as its factorization.

13720049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280015 (or 280008 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 13720049 is about 3704.0584498628. The cubic root of 13720049 is about 239.3969175304.

The spelling of 13720049 in words is "thirteen million, seven hundred twenty thousand, forty-nine".