13001639 has 4 divisors (see below), whose sum is σ = 14859024. Its totient is φ = 11144256.

The previous prime is 13001627. The next prime is 13001663. The reversal of 13001639 is 93610031.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93610031 = 53 ⋅1766227.

It is a cyclic number.

It is not a de Polignac number, because 13001639 - 2¹⁶ = 12936103 is a prime.

It is a super-3 number, since 3×13001639³ (a number of 22 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13001669) 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, 928682 + ... + 928695.

It is an arithmetic number, because the mean of its divisors is an integer number (3714756).

Almost surely, 2^13001639 is an apocalyptic number.

13001639 is a deficient number, since it is larger than the sum of its proper divisors (1857385).

13001639 is an equidigital number, since it uses as much as digits as its factorization.

13001639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1857384.

The product of its (nonzero) digits is 486, while the sum is 23.

The square root of 13001639 is about 3605.7785567059. The cubic root of 13001639 is about 235.1433499916.

The spelling of 13001639 in words is "thirteen million, one thousand, six hundred thirty-nine".