12790781 has 4 divisors (see below), whose sum is σ = 13464000. Its totient is φ = 12117564.

The previous prime is 12790763. The next prime is 12790793. The reversal of 12790781 is 18709721.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12790781 - 2¹⁰ = 12789757 is a prime.

It is a super-2 number, since 2×12790781² = 327208157179922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12790381) 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, 336581 + ... + 336618.

It is an arithmetic number, because the mean of its divisors is an integer number (3366000).

Almost surely, 2^12790781 is an apocalyptic number.

It is an amenable number.

12790781 is a deficient number, since it is larger than the sum of its proper divisors (673219).

12790781 is an equidigital number, since it uses as much as digits as its factorization.

12790781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 673218.

The product of its (nonzero) digits is 7056, while the sum is 35.

The square root of 12790781 is about 3576.4201375118. The cubic root of 12790781 is about 233.8652461533.

The spelling of 12790781 in words is "twelve million, seven hundred ninety thousand, seven hundred eighty-one".