139240889 has 2 divisors, whose sum is σ = 139240890. Its totient is φ = 139240888.

The previous prime is 139240847. The next prime is 139240891. The reversal of 139240889 is 988042931.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87516025 + 51724864 = 9355^2 + 7192^2 .

It is a cyclic number.

It is not a de Polignac number, because 139240889 - 2¹² = 139236793 is a prime.

It is a Sophie Germain prime.

Together with 139240891, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (139240819) 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, 69620444 + 69620445.

It is an arithmetic number, because the mean of its divisors is an integer number (69620445).

Almost surely, 2^139240889 is an apocalyptic number.

It is an amenable number.

139240889 is a deficient number, since it is larger than the sum of its proper divisors (1).

139240889 is an equidigital number, since it uses as much as digits as its factorization.

139240889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 124416, while the sum is 44.

The square root of 139240889 is about 11800.0376694314. The cubic root of 139240889 is about 518.3092137213.

The spelling of 139240889 in words is "one hundred thirty-nine million, two hundred forty thousand, eight hundred eighty-nine".