1284421 has 2 divisors, whose sum is σ = 1284422. Its totient is φ = 1284420.

The previous prime is 1284383. The next prime is 1284427. The reversal of 1284421 is 1244821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1113025 + 171396 = 1055^2 + 414^2 .

It is an emirp because it is prime and its reverse (1244821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1284421 - 2⁷ = 1284293 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1284392 and 1284401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1284427) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 642210 + 642211.

It is an arithmetic number, because the mean of its divisors is an integer number (642211).

2^1284421 is an apocalyptic number.

It is an amenable number.

1284421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1284421 is an equidigital number, since it uses as much as digits as its factorization.

1284421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 512, while the sum is 22.

The square root of 1284421 is about 1133.3229901489. The cubic root of 1284421 is about 108.7015656076.

The spelling of 1284421 in words is "one million, two hundred eighty-four thousand, four hundred twenty-one".