1985587815 has 32 divisors (see below), whose sum is σ = 3320464896. Its totient is φ = 1011288960.

The previous prime is 1985587771. The next prime is 1985587853. The reversal of 1985587815 is 5187855891.

It is not a de Polignac number, because 1985587815 - 2¹⁷ = 1985456743 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 223692 + ... + 232398.

It is an arithmetic number, because the mean of its divisors is an integer number (103764528).

Almost surely, 2^1985587815 is an apocalyptic number.

1985587815 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1985587815 is a deficient number, since it is larger than the sum of its proper divisors (1334877081).

1985587815 is a wasteful number, since it uses less digits than its factorization.

1985587815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9399.

The product of its digits is 4032000, while the sum is 57.

The square root of 1985587815 is about 44559.9350874752. The cubic root of 1985587815 is about 1256.8873820104.

The spelling of 1985587815 in words is "one billion, nine hundred eighty-five million, five hundred eighty-seven thousand, eight hundred fifteen".