1240139 has 2 divisors, whose sum is σ = 1240140. Its totient is φ = 1240138.

The previous prime is 1240117. The next prime is 1240153. The reversal of 1240139 is 9310421.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1240139 - 2¹⁶ = 1174603 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1240139.

It is not a weakly prime, because it can be changed into another prime (1240159) 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, 620069 + 620070.

It is an arithmetic number, because the mean of its divisors is an integer number (620070).

2^1240139 is an apocalyptic number.

1240139 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240139 is an equidigital number, since it uses as much as digits as its factorization.

1240139 is an odious number, because the sum of its binary digits is odd.

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

The square root of 1240139 is about 1113.6152836595. The cubic root of 1240139 is about 107.4377212729.

The spelling of 1240139 in words is "one million, two hundred forty thousand, one hundred thirty-nine".