1392221 has 2 divisors, whose sum is σ = 1392222. Its totient is φ = 1392220.

The previous prime is 1392197. The next prime is 1392229. The reversal of 1392221 is 1222931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1243225 + 148996 = 1115^2 + 386^2 .

It is an emirp because it is prime and its reverse (1222931) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1392221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1392193 and 1392202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1392229) by changing a digit.

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

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 696110 + 696111.

It is an arithmetic number, because the mean of its divisors is an integer number (696111).

2^1392221 is an apocalyptic number.

It is an amenable number.

1392221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1392221 is an equidigital number, since it uses as much as digits as its factorization.

1392221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 216, while the sum is 20.

The square root of 1392221 is about 1179.9241501046. The cubic root of 1392221 is about 111.6613120870.

The spelling of 1392221 in words is "one million, three hundred ninety-two thousand, two hundred twenty-one".