1986947892 has 36 divisors (see below), whose sum is σ = 5023934916. Its totient is φ = 662135040.

The previous prime is 1986947891. The next prime is 1986947917. The reversal of 1986947892 is 2987496891.

1986947892 is a `hidden beast` number, since 19 + 8 + 69 + 478 + 92 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1719429156 + 267518736 = 41466^2 + 16356^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1986947891) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 220842 + ... + 229662.

Almost surely, 2^1986947892 is an apocalyptic number.

1986947892 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1986947892 is an abundant number, since it is smaller than the sum of its proper divisors (3036987024).

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

1986947892 is a wasteful number, since it uses less digits than its factorization.

1986947892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15088 (or 15083 counting only the distinct ones).

The product of its digits is 15676416, while the sum is 63.

The square root of 1986947892 is about 44575.1936843801. The cubic root of 1986947892 is about 1257.1742951086.

The spelling of 1986947892 in words is "one billion, nine hundred eighty-six million, nine hundred forty-seven thousand, eight hundred ninety-two".