1237240139 has 2 divisors, whose sum is σ = 1237240140. Its totient is φ = 1237240138.

The previous prime is 1237240129. The next prime is 1237240153. The reversal of 1237240139 is 9310427321.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1237240139 is a prime.

It is not a weakly prime, because it can be changed into another prime (1237240129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 618620069 + 618620070.

It is an arithmetic number, because the mean of its divisors is an integer number (618620070).

Almost surely, 2^1237240139 is an apocalyptic number.

1237240139 is a deficient number, since it is larger than the sum of its proper divisors (1).

1237240139 is an equidigital number, since it uses as much as digits as its factorization.

1237240139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 1237240139 is about 35174.4245013334. The cubic root of 1237240139 is about 1073.5394302764.

The spelling of 1237240139 in words is "one billion, two hundred thirty-seven million, two hundred forty thousand, one hundred thirty-nine".