13720739 has 2 divisors, whose sum is σ = 13720740. Its totient is φ = 13720738.

The previous prime is 13720709. The next prime is 13720753. The reversal of 13720739 is 93702731.

13720739 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is an emirp because it is prime and its reverse (93702731) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13720739 is a prime.

It is a super-2 number, since 2×13720739² = 376517357412242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (13720709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6860369 + 6860370.

It is an arithmetic number, because the mean of its divisors is an integer number (6860370).

Almost surely, 2^13720739 is an apocalyptic number.

13720739 is a deficient number, since it is larger than the sum of its proper divisors (1).

13720739 is an equidigital number, since it uses as much as digits as its factorization.

13720739 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7938, while the sum is 32.

The square root of 13720739 is about 3704.1515897706. The cubic root of 13720739 is about 239.4009306624.

The spelling of 13720739 in words is "thirteen million, seven hundred twenty thousand, seven hundred thirty-nine".