12763721 has 2 divisors, whose sum is σ = 12763722. Its totient is φ = 12763720.

The previous prime is 12763717. The next prime is 12763727. The reversal of 12763721 is 12736721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12390400 + 373321 = 3520^2 + 611^2 .

It is a cyclic number.

It is not a de Polignac number, because 12763721 - 2² = 12763717 is a prime.

It is not a weakly prime, because it can be changed into another prime (12763727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6381860 + 6381861.

It is an arithmetic number, because the mean of its divisors is an integer number (6381861).

Almost surely, 2^12763721 is an apocalyptic number.

It is an amenable number.

12763721 is a deficient number, since it is larger than the sum of its proper divisors (1).

12763721 is an equidigital number, since it uses as much as digits as its factorization.

12763721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3528, while the sum is 29.

The square root of 12763721 is about 3572.6350219411. The cubic root of 12763721 is about 233.7002090179.

Subtracting from 12763721 its reverse (12736721), we obtain a cube (27000 = 30³).

The spelling of 12763721 in words is "twelve million, seven hundred sixty-three thousand, seven hundred twenty-one".