1246639 has 2 divisors, whose sum is σ = 1246640. Its totient is φ = 1246638.

The previous prime is 1246631. The next prime is 1246667. The reversal of 1246639 is 9366421.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1246639 - 2³ = 1246631 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1246639.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1246631) 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, 623319 + 623320.

It is an arithmetic number, because the mean of its divisors is an integer number (623320).

2^1246639 is an apocalyptic number.

1246639 is a deficient number, since it is larger than the sum of its proper divisors (1).

1246639 is an equidigital number, since it uses as much as digits as its factorization.

1246639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 31.

The square root of 1246639 is about 1116.5298921211. The cubic root of 1246639 is about 107.6251004400.

The spelling of 1246639 in words is "one million, two hundred forty-six thousand, six hundred thirty-nine".