1247663 has 2 divisors, whose sum is σ = 1247664. Its totient is φ = 1247662.

The previous prime is 1247651. The next prime is 1247693. The reversal of 1247663 is 3667421.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1247663 - 2⁶ = 1247599 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1247693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 623831 + 623832.

It is an arithmetic number, because the mean of its divisors is an integer number (623832).

2^1247663 is an apocalyptic number.

1247663 is a deficient number, since it is larger than the sum of its proper divisors (1).

1247663 is an equidigital number, since it uses as much as digits as its factorization.

1247663 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6048, while the sum is 29.

The square root of 1247663 is about 1116.9883616224. The cubic root of 1247663 is about 107.6545604364.

The spelling of 1247663 in words is "one million, two hundred forty-seven thousand, six hundred sixty-three".