12493721 has 2 divisors, whose sum is σ = 12493722. Its totient is φ = 12493720.

The previous prime is 12493717. The next prime is 12493727. The reversal of 12493721 is 12739421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11316496 + 1177225 = 3364^2 + 1085^2 .

It is a cyclic number.

It is not a de Polignac number, because 12493721 - 2² = 12493717 is a prime.

It is not a weakly prime, because it can be changed into another prime (12493727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6246860 + 6246861.

It is an arithmetic number, because the mean of its divisors is an integer number (6246861).

Almost surely, 2^12493721 is an apocalyptic number.

It is an amenable number.

12493721 is a deficient number, since it is larger than the sum of its proper divisors (1).

12493721 is an equidigital number, since it uses as much as digits as its factorization.

12493721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3024, while the sum is 29.

The square root of 12493721 is about 3534.6458096958. The cubic root of 12493721 is about 232.0405757905.

The spelling of 12493721 in words is "twelve million, four hundred ninety-three thousand, seven hundred twenty-one".