139423237 has 2 divisors, whose sum is σ = 139423238. Its totient is φ = 139423236.

The previous prime is 139423201. The next prime is 139423261. The reversal of 139423237 is 732324931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 88529281 + 50893956 = 9409^2 + 7134^2 .

It is a cyclic number.

It is not a de Polignac number, because 139423237 - 2¹⁵ = 139390469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139424237) 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, 69711618 + 69711619.

It is an arithmetic number, because the mean of its divisors is an integer number (69711619).

Almost surely, 2^139423237 is an apocalyptic number.

It is an amenable number.

139423237 is a deficient number, since it is larger than the sum of its proper divisors (1).

139423237 is an equidigital number, since it uses as much as digits as its factorization.

139423237 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27216, while the sum is 34.

The square root of 139423237 is about 11807.7617269320. The cubic root of 139423237 is about 518.5353719560.

The spelling of 139423237 in words is "one hundred thirty-nine million, four hundred twenty-three thousand, two hundred thirty-seven".