12381639 has 8 divisors (see below), whose sum is σ = 16536960. Its totient is φ = 8240376.

The previous prime is 12381599. The next prime is 12381641. The reversal of 12381639 is 93618321.

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

It is not a de Polignac number, because 12381639 - 2⁷ = 12381511 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12381689) 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, 1249 + ... + 5130.

It is an arithmetic number, because the mean of its divisors is an integer number (2067120).

Almost surely, 2^12381639 is an apocalyptic number.

12381639 is a deficient number, since it is larger than the sum of its proper divisors (4155321).

12381639 is an equidigital number, since it uses as much as digits as its factorization.

12381639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7029.

The product of its digits is 7776, while the sum is 33.

The square root of 12381639 is about 3518.7553197118. The cubic root of 12381639 is about 231.3446066275.

The spelling of 12381639 in words is "twelve million, three hundred eighty-one thousand, six hundred thirty-nine".