12639145 has 8 divisors (see below), whose sum is σ = 15194304. Its totient is φ = 10093104.

The previous prime is 12639127. The next prime is 12639149. The reversal of 12639145 is 54193621.

12639145 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12639145 - 2¹⁹ = 12114857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12639149) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1282 + ... + 5188.

It is an arithmetic number, because the mean of its divisors is an integer number (1899288).

Almost surely, 2^12639145 is an apocalyptic number.

It is an amenable number.

12639145 is a deficient number, since it is larger than the sum of its proper divisors (2555159).

12639145 is an equidigital number, since it uses as much as digits as its factorization.

12639145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4559.

The product of its digits is 6480, while the sum is 31.

The square root of 12639145 is about 3555.1575211234. The cubic root of 12639145 is about 232.9374045167.

It can be divided in two parts, 12639 and 145, that multiplied together give a triangular number (1832655 = T₁₉₁₄).

The spelling of 12639145 in words is "twelve million, six hundred thirty-nine thousand, one hundred forty-five".