1421639 has 2 divisors, whose sum is σ = 1421640. Its totient is φ = 1421638.

The previous prime is 1421627. The next prime is 1421647. The reversal of 1421639 is 9361241.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1421639 - 2¹² = 1417543 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 (1421669) 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, 710819 + 710820.

It is an arithmetic number, because the mean of its divisors is an integer number (710820).

2^1421639 is an apocalyptic number.

1421639 is a deficient number, since it is larger than the sum of its proper divisors (1).

1421639 is an equidigital number, since it uses as much as digits as its factorization.

1421639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 26.

The square root of 1421639 is about 1192.3250395760. The cubic root of 1421639 is about 112.4423144591.

The spelling of 1421639 in words is "one million, four hundred twenty-one thousand, six hundred thirty-nine".