1989918522 has 16 divisors (see below), whose sum is σ = 4422041280. Its totient is φ = 663306156.

The previous prime is 1989918509. The next prime is 1989918529. The reversal of 1989918522 is 2258199891.

1989918522 is a `hidden beast` number, since 19 + 8 + 99 + 18 + 522 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54), and also a Moran number because the ratio is a prime number: 36850343 = 1989918522 / (1 + 9 + 8 + 9 + 9 + 1 + 8 + 5 + 2 + 2).

It is not an unprimeable number, because it can be changed into a prime (1989918529) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18425118 + ... + 18425225.

It is an arithmetic number, because the mean of its divisors is an integer number (276377580).

Almost surely, 2^1989918522 is an apocalyptic number.

1989918522 is an abundant number, since it is smaller than the sum of its proper divisors (2432122758).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1989918522 is a wasteful number, since it uses less digits than its factorization.

1989918522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36850354 (or 36850348 counting only the distinct ones).

The product of its digits is 933120, while the sum is 54.

The square root of 1989918522 is about 44608.5027993543. The cubic root of 1989918522 is about 1257.8005051317.

The spelling of 1989918522 in words is "one billion, nine hundred eighty-nine million, nine hundred eighteen thousand, five hundred twenty-two".