999422 has 4 divisors (see below), whose sum is σ = 1499136. Its totient is φ = 499710.

The previous prime is 999389. The next prime is 999431. The reversal of 999422 is 224999.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 224999 = 71 ⋅3169.

It is a nialpdrome in base 10.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 249854 + ... + 249857.

It is an arithmetic number, because the mean of its divisors is an integer number (374784).

2⁹⁹⁹⁴²² is an apocalyptic number.

999422 is a deficient number, since it is larger than the sum of its proper divisors (499714).

999422 is a wasteful number, since it uses less digits than its factorization.

999422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 499713.

The product of its digits is 11664, while the sum is 35.

The square root of 999422 is about 999.7109582274. The cubic root of 999422 is about 99.9807296201.

The spelling of 999422 in words is "nine hundred ninety-nine thousand, four hundred twenty-two".