1986686460 has 192 divisors, whose sum is σ = 6960844800. Its totient is φ = 466041600.

The previous prime is 1986686437. The next prime is 1986686461. The reversal of 1986686460 is 646866891.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 1986686397 and 1986686406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1986686461) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 178746 + ... + 189534.

It is an arithmetic number, because the mean of its divisors is an integer number (36254400).

Almost surely, 2^1986686460 is an apocalyptic number.

1986686460 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 1986686460, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3480422400).

1986686460 is an abundant number, since it is smaller than the sum of its proper divisors (4974158340).

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

1986686460 is a wasteful number, since it uses less digits than its factorization.

1986686460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10849 (or 10841 counting only the distinct ones).

The product of its (nonzero) digits is 2985984, while the sum is 54.

The square root of 1986686460 is about 44572.2611048621. The cubic root of 1986686460 is about 1257.1191552620.

The spelling of 1986686460 in words is "one billion, nine hundred eighty-six million, six hundred eighty-six thousand, four hundred sixty".