990422 has 4 divisors (see below), whose sum is σ = 1485636. Its totient is φ = 495210.

The previous prime is 990397. The next prime is 990463. The reversal of 990422 is 224099.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 224099 = 31 ⋅7229.

It is a junction number, because it is equal to n+sod(n) for n = 990391 and 990400.

It is a congruent number.

It is an unprimeable number.

990422 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 247604 + ... + 247607.

It is an arithmetic number, because the mean of its divisors is an integer number (371409).

2⁹⁹⁰⁴²² is an apocalyptic number.

990422 is a deficient number, since it is larger than the sum of its proper divisors (495214).

990422 is a wasteful number, since it uses less digits than its factorization.

990422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 495213.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 990422 is about 995.1994774918. The cubic root of 990422 is about 99.6797085625.

The spelling of 990422 in words is "nine hundred ninety thousand, four hundred twenty-two".