999001020 has 48 divisors (see below), whose sum is σ = 2798990208. Its totient is φ = 266230080.

The previous prime is 999001007. The next prime is 999001043. The reversal of 999001020 is 20100999.

It is a super-2 number, since 2×999001020² = 1996006075922080800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 110055 + ... + 118785.

It is an arithmetic number, because the mean of its divisors is an integer number (58312296).

Almost surely, 2^999001020 is an apocalyptic number.

It is an amenable number.

999001020 is an abundant number, since it is smaller than the sum of its proper divisors (1799989188).

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

999001020 is a wasteful number, since it uses less digits than its factorization.

999001020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10650 (or 10648 counting only the distinct ones).

The product of its (nonzero) digits is 1458, while the sum is 30.

The square root of 999001020 is about 31606.9773942400. The cubic root of 999001020 is about 999.6668957205. Note that the first 3 decimals are identical.

The spelling of 999001020 in words is "nine hundred ninety-nine million, one thousand, twenty".