990204791 has 4 divisors (see below), whose sum is σ = 992098632. Its totient is φ = 988310952.

The previous prime is 990204781. The next prime is 990204793. The reversal of 990204791 is 197402099.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 990204791 - 2⁶ = 990204727 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 (990204793) 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, 946136 + ... + 947181.

It is an arithmetic number, because the mean of its divisors is an integer number (248024658).

Almost surely, 2^990204791 is an apocalyptic number.

990204791 is a deficient number, since it is larger than the sum of its proper divisors (1893841).

990204791 is a wasteful number, since it uses less digits than its factorization.

990204791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1893840.

The product of its (nonzero) digits is 40824, while the sum is 41.

The square root of 990204791 is about 31467.5196194425. The cubic root of 990204791 is about 996.7242112587.

The spelling of 990204791 in words is "nine hundred ninety million, two hundred four thousand, seven hundred ninety-one".