1011863985 has 16 divisors (see below), whose sum is σ = 1766162880. Its totient is φ = 490600640.

The previous prime is 1011863959. The next prime is 1011863989. The reversal of 1011863985 is 5893681101.

It is not a de Polignac number, because 1011863985 - 2⁶ = 1011863921 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1011863989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3066090 + ... + 3066419.

It is an arithmetic number, because the mean of its divisors is an integer number (110385180).

Almost surely, 2^1011863985 is an apocalyptic number.

1011863985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1011863985 is a deficient number, since it is larger than the sum of its proper divisors (754298895).

1011863985 is a wasteful number, since it uses less digits than its factorization.

1011863985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6132528.

The product of its (nonzero) digits is 51840, while the sum is 42.

The square root of 1011863985 is about 31809.8095718915. The cubic root of 1011863985 is about 1003.9391245901.

The spelling of 1011863985 in words is "one billion, eleven million, eight hundred sixty-three thousand, nine hundred eighty-five".