12639530 has 8 divisors (see below), whose sum is σ = 22751172. Its totient is φ = 5055808.

The previous prime is 12639527. The next prime is 12639547. The reversal of 12639530 is 3593621.

It can be written as a sum of positive squares in 2 ways, for example, as 12609601 + 29929 = 3551^2 + 173^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 12639493 and 12639502.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 631967 + ... + 631986.

Almost surely, 2^12639530 is an apocalyptic number.

12639530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12639530 is a deficient number, since it is larger than the sum of its proper divisors (10111642).

12639530 is a wasteful number, since it uses less digits than its factorization.

12639530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1263960.

The product of its (nonzero) digits is 4860, while the sum is 29.

The square root of 12639530 is about 3555.2116673976. The cubic root of 12639530 is about 232.9397696554.

The spelling of 12639530 in words is "twelve million, six hundred thirty-nine thousand, five hundred thirty".