137720239 has 2 divisors, whose sum is σ = 137720240. Its totient is φ = 137720238.

The previous prime is 137720237. The next prime is 137720257. The reversal of 137720239 is 932027731.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 137720239 - 2¹ = 137720237 is a prime.

Together with 137720237, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (137720237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68860119 + 68860120.

It is an arithmetic number, because the mean of its divisors is an integer number (68860120).

Almost surely, 2^137720239 is an apocalyptic number.

137720239 is a deficient number, since it is larger than the sum of its proper divisors (1).

137720239 is an equidigital number, since it uses as much as digits as its factorization.

137720239 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15876, while the sum is 34.

The square root of 137720239 is about 11735.4266645913. The cubic root of 137720239 is about 516.4154844725.

The spelling of 137720239 in words is "one hundred thirty-seven million, seven hundred twenty thousand, two hundred thirty-nine".