999881622 has 144 divisors (see below), whose sum is σ = 2458583712. Its totient is φ = 292976640.

The previous prime is 999881621. The next prime is 999881651. The reversal of 999881622 is 226188999.

999881622 is a `hidden beast` number, since 9 + 9 + 9 + 8 + 8 + 1 + 622 = 666.

Its product of digits (1119744) is a multiple of the sum of its prime divisors (243).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999881621) 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 71 ways as a sum of consecutive naturals, for example, 7298338 + ... + 7298474.

It is an arithmetic number, because the mean of its divisors is an integer number (17073498).

Almost surely, 2^999881622 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 999881622, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1229291856).

999881622 is an abundant number, since it is smaller than the sum of its proper divisors (1458702090).

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

999881622 is a wasteful number, since it uses less digits than its factorization.

999881622 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263 (or 243 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 54.

The square root of 999881622 is about 31620.9048257636. The cubic root of 999881622 is about 999.9605391095.

The spelling of 999881622 in words is "nine hundred ninety-nine million, eight hundred eighty-one thousand, six hundred twenty-two".