12639955 has 8 divisors (see below), whose sum is σ = 15241104. Its totient is φ = 10063200.

The previous prime is 12639953. The next prime is 12639961. The reversal of 12639955 is 55993621.

It is a happy number.

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

It is not a de Polignac number, because 12639955 - 2¹ = 12639953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12639953) 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 7 ways as a sum of consecutive naturals, for example, 4936 + ... + 7045.

It is an arithmetic number, because the mean of its divisors is an integer number (1905138).

Almost surely, 2^12639955 is an apocalyptic number.

12639955 is a deficient number, since it is larger than the sum of its proper divisors (2601149).

12639955 is a wasteful number, since it uses less digits than its factorization.

12639955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12197.

The product of its digits is 72900, while the sum is 40.

The square root of 12639955 is about 3555.2714383012. The cubic root of 12639955 is about 232.9423804669.

The spelling of 12639955 in words is "twelve million, six hundred thirty-nine thousand, nine hundred fifty-five".