1421663 has 2 divisors, whose sum is σ = 1421664. Its totient is φ = 1421662.

The previous prime is 1421647. The next prime is 1421669. The reversal of 1421663 is 3661241.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1421663 - 2⁴ = 1421647 is a prime.

It is a super-2 number, since 2×1421663² = 4042251371138, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1421669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 710831 + 710832.

It is an arithmetic number, because the mean of its divisors is an integer number (710832).

2^1421663 is an apocalyptic number.

1421663 is a deficient number, since it is larger than the sum of its proper divisors (1).

1421663 is an equidigital number, since it uses as much as digits as its factorization.

1421663 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 23.

The square root of 1421663 is about 1192.3351039033. The cubic root of 1421663 is about 112.4429472031.

The spelling of 1421663 in words is "one million, four hundred twenty-one thousand, six hundred sixty-three".