12640339 has 8 divisors (see below), whose sum is σ = 13340240. Its totient is φ = 11943936.

The previous prime is 12640307. The next prime is 12640351. The reversal of 12640339 is 93304621.

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

It is a 14-Lehmer number, since φ(12640339) divides (12640339-1)¹⁴.

It is a cyclic number.

It is not a de Polignac number, because 12640339 - 2⁵ = 12640307 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12640399) 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, 10387 + ... + 11539.

It is an arithmetic number, because the mean of its divisors is an integer number (1667530).

Almost surely, 2^12640339 is an apocalyptic number.

12640339 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

12640339 is a deficient number, since it is larger than the sum of its proper divisors (699901).

12640339 is a wasteful number, since it uses less digits than its factorization.

12640339 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1749.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 12640339 is about 3555.3254422064. The cubic root of 12640339 is about 232.9447393616.

The spelling of 12640339 in words is "twelve million, six hundred forty thousand, three hundred thirty-nine".