13120639 has 4 divisors (see below), whose sum is σ = 14995024. Its totient is φ = 11246256.

The previous prime is 13120631. The next prime is 13120643. The reversal of 13120639 is 93602131.

13120639 is nontrivially palindromic in base 6.

13120639 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93602131 = 7 ⋅13371733.

It is not a de Polignac number, because 13120639 - 2³ = 13120631 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 (13120631) 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, 937182 + ... + 937195.

It is an arithmetic number, because the mean of its divisors is an integer number (3748756).

Almost surely, 2^13120639 is an apocalyptic number.

13120639 is a deficient number, since it is larger than the sum of its proper divisors (1874385).

13120639 is an equidigital number, since it uses as much as digits as its factorization.

13120639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1874384.

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 13120639 is about 3622.2422613624. The cubic root of 13120639 is about 235.8585705809.

The spelling of 13120639 in words is "thirteen million, one hundred twenty thousand, six hundred thirty-nine".