1986530085 has 24 divisors (see below), whose sum is σ = 3624547680. Its totient is φ = 1003720032.

The previous prime is 1986530057. The next prime is 1986530089. The reversal of 1986530085 is 5800356891.

It is not a de Polignac number, because 1986530085 - 2⁸ = 1986529829 is a prime.

It is a super-2 number, since 2×1986530085² = 7892603557220214450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1986530085.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1986530089) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1160859 + ... + 1162568.

It is an arithmetic number, because the mean of its divisors is an integer number (151022820).

Almost surely, 2^1986530085 is an apocalyptic number.

1986530085 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1986530085 is a deficient number, since it is larger than the sum of its proper divisors (1638017595).

1986530085 is a wasteful number, since it uses less digits than its factorization.

1986530085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2323457 (or 2323454 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 45.

The square root of 1986530085 is about 44570.5068963771. The cubic root of 1986530085 is about 1257.0861711668.

The spelling of 1986530085 in words is "one billion, nine hundred eighty-six million, five hundred thirty thousand, eighty-five".