1989164388 has 48 divisors (see below), whose sum is σ = 4725826560. Its totient is φ = 651089184.

The previous prime is 1989164381. The next prime is 1989164417. The reversal of 1989164388 is 8834619891.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (1989164381) 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, 160353 + ... + 172311.

It is an arithmetic number, because the mean of its divisors is an integer number (98454720).

Almost surely, 2^1989164388 is an apocalyptic number.

It is an amenable number.

1989164388 is an abundant number, since it is smaller than the sum of its proper divisors (2736662172).

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

1989164388 is a wasteful number, since it uses less digits than its factorization.

1989164388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12216 (or 12214 counting only the distinct ones).

The product of its digits is 2985984, while the sum is 57.

The square root of 1989164388 is about 44600.0491927980. The cubic root of 1989164388 is about 1257.6415924313.

The spelling of 1989164388 in words is "one billion, nine hundred eighty-nine million, one hundred sixty-four thousand, three hundred eighty-eight".