990422903 has 4 divisors (see below), whose sum is σ = 992023560. Its totient is φ = 988822248.

The previous prime is 990422897. The next prime is 990422929. The reversal of 990422903 is 309224099.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 309224099 = 71 ⋅4355269.

It is a cyclic number.

It is not a de Polignac number, because 990422903 - 2¹⁶ = 990357367 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990422003) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 799400 + ... + 800637.

It is an arithmetic number, because the mean of its divisors is an integer number (248005890).

Almost surely, 2^990422903 is an apocalyptic number.

990422903 is a deficient number, since it is larger than the sum of its proper divisors (1600657).

990422903 is a wasteful number, since it uses less digits than its factorization.

990422903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1600656.

The product of its (nonzero) digits is 34992, while the sum is 38.

The square root of 990422903 is about 31470.9850973877. The cubic root of 990422903 is about 996.7973885627.

The spelling of 990422903 in words is "nine hundred ninety million, four hundred twenty-two thousand, nine hundred three".