1248721 has 2 divisors, whose sum is σ = 1248722. Its totient is φ = 1248720.

The previous prime is 1248703. The next prime is 1248757. The reversal of 1248721 is 1278421.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1234321 + 14400 = 1111^2 + 120^2 .

It is a cyclic number.

It is not a de Polignac number, because 1248721 - 2⁷ = 1248593 is a prime.

It is not a weakly prime, because it can be changed into another prime (1248781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 624360 + 624361.

It is an arithmetic number, because the mean of its divisors is an integer number (624361).

2^1248721 is an apocalyptic number.

It is an amenable number.

1248721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1248721 is an equidigital number, since it uses as much as digits as its factorization.

1248721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 896, while the sum is 25.

The square root of 1248721 is about 1117.4618561723. The cubic root of 1248721 is about 107.6849816707.

The spelling of 1248721 in words is "one million, two hundred forty-eight thousand, seven hundred twenty-one".