1188985389 has 32 divisors (see below), whose sum is σ = 1722783744. Its totient is φ = 726485760.

The previous prime is 1188985387. The next prime is 1188985481. The reversal of 1188985389 is 9835898811.

It is not a de Polignac number, because 1188985389 - 2¹ = 1188985387 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1188985387) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1014774 + ... + 1015944.

It is an arithmetic number, because the mean of its divisors is an integer number (53836992).

Almost surely, 2^1188985389 is an apocalyptic number.

It is an amenable number.

1188985389 is a deficient number, since it is larger than the sum of its proper divisors (533798355).

1188985389 is a wasteful number, since it uses less digits than its factorization.

1188985389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1697.

The product of its digits is 4976640, while the sum is 60.

The square root of 1188985389 is about 34481.6674335798. The cubic root of 1188985389 is about 1059.3972451294.

The spelling of 1188985389 in words is "one billion, one hundred eighty-eight million, nine hundred eighty-five thousand, three hundred eighty-nine".