12639272 has 8 divisors (see below), whose sum is σ = 23698650. Its totient is φ = 6319632.

The previous prime is 12639269. The next prime is 12639283. The reversal of 12639272 is 27293621.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 9449476 + 3189796 = 3074^2 + 1786^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 789947 + ... + 789962.

Almost surely, 2^12639272 is an apocalyptic number.

It is an amenable number.

12639272 is a deficient number, since it is larger than the sum of its proper divisors (11059378).

12639272 is a wasteful number, since it uses less digits than its factorization.

12639272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1579915 (or 1579911 counting only the distinct ones).

The product of its digits is 9072, while the sum is 32.

The square root of 12639272 is about 3555.1753824530. The cubic root of 12639272 is about 232.9381847106.

The spelling of 12639272 in words is "twelve million, six hundred thirty-nine thousand, two hundred seventy-two".