139234973 has 2 divisors, whose sum is σ = 139234974. Its totient is φ = 139234972.

The previous prime is 139234969. The next prime is 139234993. The reversal of 139234973 is 379432931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 133217764 + 6017209 = 11542^2 + 2453^2 .

It is an emirp because it is prime and its reverse (379432931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 139234973 - 2² = 139234969 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 139234973.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139234993) 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, 69617486 + 69617487.

It is an arithmetic number, because the mean of its divisors is an integer number (69617487).

Almost surely, 2^139234973 is an apocalyptic number.

It is an amenable number.

139234973 is a deficient number, since it is larger than the sum of its proper divisors (1).

139234973 is an equidigital number, since it uses as much as digits as its factorization.

139234973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 122472, while the sum is 41.

The square root of 139234973 is about 11799.7869896028. The cubic root of 139234973 is about 518.3018730597.

The spelling of 139234973 in words is "one hundred thirty-nine million, two hundred thirty-four thousand, nine hundred seventy-three".