990022 has 12 divisors (see below), whose sum is σ = 1632708. Its totient is φ = 449900.
The previous prime is 990013. The next prime is 990023. The reversal of 990022 is 220099.
It is a Harshad number since it is a multiple of its sum of digits (22).
It is a zygodrome in base 10.
It is a junction number, because it is equal to n+sod(n) for n = 989975 and 990002.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (990023) by changing a digit.
990022 is an untouchable number, because it is not equal to the sum of proper divisors of any 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 5 ways as a sum of consecutive naturals, for example, 1804 + ... + 2287.
It is an arithmetic number, because the mean of its divisors is an integer number (136059).
2990022 is an apocalyptic number.
990022 is a deficient number, since it is larger than the sum of its proper divisors (642686).
990022 is a wasteful number, since it uses less digits than its factorization.
990022 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 4115 (or 4104 counting only the distinct ones).
The product of its (nonzero) digits is 324, while the sum is 22.
The square root of 990022 is about 994.9984924612. The cubic root of 990022 is about 99.6662875991. Note that the first 3 decimals are identical.
Adding to 990022 its reverse (220099), we get a palindrome (1210121).
The spelling of 990022 in words is "nine hundred ninety thousand, twenty-two".
• e-mail: info -at- numbersaplenty.com • Privacy notice • done in 0.068 sec. • engine limits •