990810239 has 4 divisors (see below), whose sum is σ = 1004383056. Its totient is φ = 977237424.

The previous prime is 990810229. The next prime is 990810241. The reversal of 990810239 is 932018099.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 932018099 = 7937 ⋅117427.

It is a cyclic number.

It is not a de Polignac number, because 990810239 - 2⁸ = 990809983 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 990810196 and 990810205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990810229) 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, 6786299 + ... + 6786444.

It is an arithmetic number, because the mean of its divisors is an integer number (251095764).

Almost surely, 2^990810239 is an apocalyptic number.

990810239 is a deficient number, since it is larger than the sum of its proper divisors (13572817).

990810239 is a wasteful number, since it uses less digits than its factorization.

990810239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13572816.

The product of its (nonzero) digits is 34992, while the sum is 41.

The square root of 990810239 is about 31477.1383546853. The cubic root of 990810239 is about 996.9273146080.

The spelling of 990810239 in words is "nine hundred ninety million, eight hundred ten thousand, two hundred thirty-nine".