1985718015 has 24 divisors (see below), whose sum is σ = 3560600160. Its totient is φ = 1022529984.

The previous prime is 1985718013. The next prime is 1985718017. The reversal of 1985718015 is 5108175891.

It is an interprime number because it is at equal distance from previous prime (1985718013) and next prime (1985718017).

It is not a de Polignac number, because 1985718015 - 2¹ = 1985718013 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1985718013) 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, 759507 + ... + 762116.

It is an arithmetic number, because the mean of its divisors is an integer number (148358340).

Almost surely, 2^1985718015 is an apocalyptic number.

1985718015 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1985718015 is a deficient number, since it is larger than the sum of its proper divisors (1574882145).

1985718015 is a wasteful number, since it uses less digits than its factorization.

1985718015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1521663 (or 1521660 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 45.

The square root of 1985718015 is about 44561.3960171806. The cubic root of 1985718015 is about 1256.9148538350.

The spelling of 1985718015 in words is "one billion, nine hundred eighty-five million, seven hundred eighteen thousand, fifteen".