1239421 has 2 divisors, whose sum is σ = 1239422. Its totient is φ = 1239420.

The previous prime is 1239397. The next prime is 1239443. The reversal of 1239421 is 1249321.

It is the 455-th star number.

It is an a-pointer prime, because the next prime (1239443) can be obtained adding 1239421 to its sum of digits (22).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1179396 + 60025 = 1086^2 + 245^2 .

It is an emirp because it is prime and its reverse (1249321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1239421 - 2¹¹ = 1237373 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1239392 and 1239401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1239461) 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, 619710 + 619711.

It is an arithmetic number, because the mean of its divisors is an integer number (619711).

2^1239421 is an apocalyptic number.

It is an amenable number.

1239421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1239421 is an equidigital number, since it uses as much as digits as its factorization.

1239421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 432, while the sum is 22.

The square root of 1239421 is about 1113.2928635359. The cubic root of 1239421 is about 107.4169829589.

The spelling of 1239421 in words is "one million, two hundred thirty-nine thousand, four hundred twenty-one".