3864558985 has 16 divisors (see below), whose sum is σ = 5329584000. Its totient is φ = 2635174656.

The previous prime is 3864558977. The next prime is 3864558989. The reversal of 3864558985 is 5898554683.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 3864558985 - 2³ = 3864558977 is a prime.

It is a super-2 number, since 2×3864558985² = 29869632297088460450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (3864558989) 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, 302160 + ... + 314689.

It is an arithmetic number, because the mean of its divisors is an integer number (333099000).

Almost surely, 2^3864558985 is an apocalyptic number.

3864558985 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

3864558985 is a deficient number, since it is larger than the sum of its proper divisors (1465025015).

3864558985 is a wasteful number, since it uses less digits than its factorization.

3864558985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 617040.

The product of its digits is 41472000, while the sum is 61.

The square root of 3864558985 is about 62165.5771709714. The cubic root of 3864558985 is about 1569.2783388687.

The spelling of 3864558985 in words is "three billion, eight hundred sixty-four million, five hundred fifty-eight thousand, nine hundred eighty-five".