899865981 has 48 divisors (see below), whose sum is σ = 1583712000. Its totient is φ = 480628224.

The previous prime is 899865977. The next prime is 899866001. The reversal of 899865981 is 189568998.

It is not a de Polignac number, because 899865981 - 2² = 899865977 is a prime.

It is a super-2 number, since 2×899865981² = 1619517567522184722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (899865931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 156760 + ... + 162398.

It is an arithmetic number, because the mean of its divisors is an integer number (32994000).

Almost surely, 2^899865981 is an apocalyptic number.

It is an amenable number.

899865981 is a deficient number, since it is larger than the sum of its proper divisors (683846019).

899865981 is a wasteful number, since it uses less digits than its factorization.

899865981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5818 (or 5815 counting only the distinct ones).

The product of its digits is 11197440, while the sum is 63.

The square root of 899865981 is about 29997.7662668406. The cubic root of 899865981 is about 965.4414585519.

The spelling of 899865981 in words is "eight hundred ninety-nine million, eight hundred sixty-five thousand, nine hundred eighty-one".