990389822 has 4 divisors (see below), whose sum is σ = 1485584736. Its totient is φ = 495194910.

The previous prime is 990389789. The next prime is 990389833. The reversal of 990389822 is 228983099.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 247597454 + ... + 247597457.

It is an arithmetic number, because the mean of its divisors is an integer number (371396184).

Almost surely, 2^990389822 is an apocalyptic number.

990389822 is a deficient number, since it is larger than the sum of its proper divisors (495194914).

990389822 is a wasteful number, since it uses less digits than its factorization.

990389822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 495194913.

The product of its (nonzero) digits is 559872, while the sum is 50.

The square root of 990389822 is about 31470.4595136455. The cubic root of 990389822 is about 996.7862904680.

The spelling of 990389822 in words is "nine hundred ninety million, three hundred eighty-nine thousand, eight hundred twenty-two".