1986399360 has 384 divisors, whose sum is σ = 7578567360. Its totient is φ = 475422720.

The previous prime is 1986399329. The next prime is 1986399379. The reversal of 1986399360 is 639936891.

1986399360 is a `hidden beast` number, since 198 + 6 + 3 + 99 + 360 = 666.

It is a tau number, because it is divible by the number of its divisors (384).

It is a junction number, because it is equal to n+sod(n) for n = 1986399297 and 1986399306.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6779374 + ... + 6779666.

Almost surely, 2^1986399360 is an apocalyptic number.

1986399360 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 1986399360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3789283680).

1986399360 is an abundant number, since it is smaller than the sum of its proper divisors (5592168000).

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

1986399360 is a wasteful number, since it uses less digits than its factorization.

1986399360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 436 (or 421 counting only the distinct ones).

The product of its (nonzero) digits is 1889568, while the sum is 54.

The square root of 1986399360 is about 44569.0403755791. The cubic root of 1986399360 is about 1257.0585960841.

The spelling of 1986399360 in words is "one billion, nine hundred eighty-six million, three hundred ninety-nine thousand, three hundred sixty".