139689983 has 2 divisors, whose sum is σ = 139689984. Its totient is φ = 139689982.

The previous prime is 139689961. The next prime is 139690021. The reversal of 139689983 is 389986931.

It is a weak prime.

It is an emirp because it is prime and its reverse (389986931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 139689983 - 2⁸ = 139689727 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139689923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69844991 + 69844992.

It is an arithmetic number, because the mean of its divisors is an integer number (69844992).

Almost surely, 2^139689983 is an apocalyptic number.

139689983 is a deficient number, since it is larger than the sum of its proper divisors (1).

139689983 is an equidigital number, since it uses as much as digits as its factorization.

139689983 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2519424, while the sum is 56.

The square root of 139689983 is about 11819.0516963080. The cubic root of 139689983 is about 518.8658503922.

The spelling of 139689983 in words is "one hundred thirty-nine million, six hundred eighty-nine thousand, nine hundred eighty-three".