990533897 has 8 divisors (see below), whose sum is σ = 1043350560. Its totient is φ = 937785600.

The previous prime is 990533891. The next prime is 990533899. The reversal of 990533897 is 798335099.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-990533897 is a prime.

It is a super-2 number, since 2×990533897² = 1962314802212013218, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (990533891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14138 + ... + 46700.

It is an arithmetic number, because the mean of its divisors is an integer number (130418820).

Almost surely, 2^990533897 is an apocalyptic number.

It is an amenable number.

990533897 is a deficient number, since it is larger than the sum of its proper divisors (52816663).

990533897 is a wasteful number, since it uses less digits than its factorization.

990533897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34183.

The product of its (nonzero) digits is 1837080, while the sum is 53.

The square root of 990533897 is about 31472.7484818215. The cubic root of 990533897 is about 996.8346232956.

The spelling of 990533897 in words is "nine hundred ninety million, five hundred thirty-three thousand, eight hundred ninety-seven".