1881385985 has 8 divisors (see below), whose sum is σ = 2376487680. Its totient is φ = 1425892464.

The previous prime is 1881385967. The next prime is 1881386057. The reversal of 1881385985 is 5895831881.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1881385985 - 2¹² = 1881381889 is a prime.

It is a super-2 number, since 2×1881385985² = 7079226449108840450, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1881385985.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9901937 + ... + 9902126.

It is an arithmetic number, because the mean of its divisors is an integer number (297060960).

Almost surely, 2^1881385985 is an apocalyptic number.

It is an amenable number.

1881385985 is a deficient number, since it is larger than the sum of its proper divisors (495101695).

1881385985 is a wasteful number, since it uses less digits than its factorization.

1881385985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19804087.

The product of its digits is 2764800, while the sum is 56.

The square root of 1881385985 is about 43374.9465129353. The cubic root of 1881385985 is about 1234.5043791409.

The spelling of 1881385985 in words is "one billion, eight hundred eighty-one million, three hundred eighty-five thousand, nine hundred eighty-five".