1989279360 has 192 divisors, whose sum is σ = 7106697000. Its totient is φ = 512139264.

The previous prime is 1989279337. The next prime is 1989279377. The reversal of 1989279360 is 639729891.

1989279360 is a `hidden beast` number, since 1 + 9 + 8 + 9 + 279 + 360 = 666.

1989279360 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1472717376 + 516561984 = 38376^2 + 22728^2 .

It is a tau number, because it is divible by the number of its divisors (192).

It is a junction number, because it is equal to n+sod(n) for n = 1989279297 and 1989279306.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 161086 + ... + 172994.

Almost surely, 2^1989279360 is an apocalyptic number.

1989279360 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1989279360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3553348500).

1989279360 is an abundant number, since it is smaller than the sum of its proper divisors (5117417640).

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

1989279360 is a wasteful number, since it uses less digits than its factorization.

1989279360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11963 (or 11948 counting only the distinct ones).

The product of its (nonzero) digits is 1469664, while the sum is 54.

The square root of 1989279360 is about 44601.3380965190. The cubic root of 1989279360 is about 1257.6658221672.

The spelling of 1989279360 in words is "one billion, nine hundred eighty-nine million, two hundred seventy-nine thousand, three hundred sixty".