139005989 has 2 divisors, whose sum is σ = 139005990. Its totient is φ = 139005988.

The previous prime is 139005983. The next prime is 139006013. The reversal of 139005989 is 989500931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74476900 + 64529089 = 8630^2 + 8033^2 .

It is an emirp because it is prime and its reverse (989500931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 139005989 - 2¹⁶ = 138940453 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139005983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69502994 + 69502995.

It is an arithmetic number, because the mean of its divisors is an integer number (69502995).

Almost surely, 2^139005989 is an apocalyptic number.

It is an amenable number.

139005989 is a deficient number, since it is larger than the sum of its proper divisors (1).

139005989 is an equidigital number, since it uses as much as digits as its factorization.

139005989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 87480, while the sum is 44.

The square root of 139005989 is about 11790.0801099908. The cubic root of 139005989 is about 518.0175863501.

The spelling of 139005989 in words is "one hundred thirty-nine million, five thousand, nine hundred eighty-nine".