1985239079 has 2 divisors, whose sum is σ = 1985239080. Its totient is φ = 1985239078.

The previous prime is 1985239049. The next prime is 1985239117. The reversal of 1985239079 is 9709325891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1985239079 - 2⁸ = 1985238823 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1985239079.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1985239019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 992619539 + 992619540.

It is an arithmetic number, because the mean of its divisors is an integer number (992619540).

Almost surely, 2^1985239079 is an apocalyptic number.

1985239079 is a deficient number, since it is larger than the sum of its proper divisors (1).

1985239079 is an equidigital number, since it uses as much as digits as its factorization.

1985239079 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1224720, while the sum is 53.

The square root of 1985239079 is about 44556.0218040166. The cubic root of 1985239079 is about 1256.8137938033.

The spelling of 1985239079 in words is "one billion, nine hundred eighty-five million, two hundred thirty-nine thousand, seventy-nine".