13720291 has 4 divisors (see below), whose sum is σ = 14775712. Its totient is φ = 12664872.

The previous prime is 13720283. The next prime is 13720307. The reversal of 13720291 is 19202731.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19202731 = 71 ⋅270461.

It is a cyclic number.

It is not a de Polignac number, because 13720291 - 2³ = 13720283 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13720211) 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, 527691 + ... + 527716.

It is an arithmetic number, because the mean of its divisors is an integer number (3693928).

Almost surely, 2^13720291 is an apocalyptic number.

13720291 is a deficient number, since it is larger than the sum of its proper divisors (1055421).

13720291 is a wasteful number, since it uses less digits than its factorization.

13720291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1055420.

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 13720291 is about 3704.0911165899. The cubic root of 13720291 is about 239.3983250500.

The spelling of 13720291 in words is "thirteen million, seven hundred twenty thousand, two hundred ninety-one".