999821260 has 12 divisors (see below), whose sum is σ = 2099624688. Its totient is φ = 399928496.

The previous prime is 999821243. The next prime is 999821261. The reversal of 999821260 is 62128999.

It is a self number, because there is not a number n which added to its sum of digits gives 999821260.

It is not an unprimeable number, because it can be changed into a prime (999821261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24995512 + ... + 24995551.

It is an arithmetic number, because the mean of its divisors is an integer number (174968724).

Almost surely, 2^999821260 is an apocalyptic number.

It is an amenable number.

999821260 is an abundant number, since it is smaller than the sum of its proper divisors (1099803428).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

999821260 is a wasteful number, since it uses less digits than its factorization.

999821260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49991072 (or 49991070 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 46.

The square root of 999821260 is about 31619.9503478421. The cubic root of 999821260 is about 999.9404164499.

The spelling of 999821260 in words is "nine hundred ninety-nine million, eight hundred twenty-one thousand, two hundred sixty".