990433238 has 4 divisors (see below), whose sum is σ = 1485649860. Its totient is φ = 495216618.

The previous prime is 990433231. The next prime is 990433261. The reversal of 990433238 is 832334099.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 832334099 = 67 ⋅12422897.

It is a junction number, because it is equal to n+sod(n) for n = 990433195 and 990433204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990433231) 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 as a sum of consecutive naturals, namely, 247608308 + ... + 247608311.

It is an arithmetic number, because the mean of its divisors is an integer number (371412465).

Almost surely, 2^990433238 is an apocalyptic number.

990433238 is a deficient number, since it is larger than the sum of its proper divisors (495216622).

990433238 is a wasteful number, since it uses less digits than its factorization.

990433238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 495216621.

The product of its (nonzero) digits is 139968, while the sum is 41.

The square root of 990433238 is about 31471.1492958233. The cubic root of 990433238 is about 996.8008557231.

The spelling of 990433238 in words is "nine hundred ninety million, four hundred thirty-three thousand, two hundred thirty-eight".