12873639 has 4 divisors (see below), whose sum is σ = 17164856. Its totient is φ = 8582424.

The previous prime is 12873611. The next prime is 12873673. The reversal of 12873639 is 93637821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93637821 = 3 ⋅31212607.

It is not a de Polignac number, because 12873639 - 2¹¹ = 12871591 is a prime.

It is a super-2 number, since 2×12873639² = 331461162204642, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12873597 and 12873606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12873689) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2145604 + ... + 2145609.

It is an arithmetic number, because the mean of its divisors is an integer number (4291214).

Almost surely, 2^12873639 is an apocalyptic number.

12873639 is a deficient number, since it is larger than the sum of its proper divisors (4291217).

12873639 is an equidigital number, since it uses as much as digits as its factorization.

12873639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4291216.

The product of its digits is 54432, while the sum is 39.

The square root of 12873639 is about 3587.9853678631. The cubic root of 12873639 is about 234.3691485117.

The spelling of 12873639 in words is "twelve million, eight hundred seventy-three thousand, six hundred thirty-nine".