1985423489 has 16 divisors (see below), whose sum is σ = 2480034816. Its totient is φ = 1550016000.

The previous prime is 1985423443. The next prime is 1985423501. The reversal of 1985423489 is 9843245891.

It is a cyclic number.

It is not a de Polignac number, because 1985423489 - 2²⁸ = 1716988033 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1985423489.

It is not an unprimeable number, because it can be changed into a prime (1985423389) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 265412 + ... + 272789.

It is an arithmetic number, because the mean of its divisors is an integer number (155002176).

Almost surely, 2^1985423489 is an apocalyptic number.

It is an amenable number.

1985423489 is a deficient number, since it is larger than the sum of its proper divisors (494611327).

1985423489 is a wasteful number, since it uses less digits than its factorization.

1985423489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 538256.

The product of its digits is 2488320, while the sum is 53.

The square root of 1985423489 is about 44558.0911732089. The cubic root of 1985423489 is about 1256.8527079839.

The spelling of 1985423489 in words is "one billion, nine hundred eighty-five million, four hundred twenty-three thousand, four hundred eighty-nine".