13212739 has 4 divisors (see below), whose sum is σ = 13520056. Its totient is φ = 12905424.

The previous prime is 13212713. The next prime is 13212743. The reversal of 13212739 is 93721231.

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

It is a cyclic number.

It is not a de Polignac number, because 13212739 - 2⁵ = 13212707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13212799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 153594 + ... + 153679.

It is an arithmetic number, because the mean of its divisors is an integer number (3380014).

Almost surely, 2^13212739 is an apocalyptic number.

13212739 is a deficient number, since it is larger than the sum of its proper divisors (307317).

13212739 is an equidigital number, since it uses as much as digits as its factorization.

13212739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307316.

The product of its digits is 2268, while the sum is 28.

The square root of 13212739 is about 3634.9331493165. The cubic root of 13212739 is about 236.4091521141.

The spelling of 13212739 in words is "thirteen million, two hundred twelve thousand, seven hundred thirty-nine".