998190321 has 16 divisors (see below), whose sum is σ = 1359116544. Its totient is φ = 651484944.

The previous prime is 998190311. The next prime is 998190337. The reversal of 998190321 is 123091899.

It is not a de Polignac number, because 998190321 - 2¹⁴ = 998173937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (998190311) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17530 + ... + 47996.

It is an arithmetic number, because the mean of its divisors is an integer number (84944784).

Almost surely, 2^998190321 is an apocalyptic number.

It is an amenable number.

998190321 is a deficient number, since it is larger than the sum of its proper divisors (360926223).

998190321 is a wasteful number, since it uses less digits than its factorization.

998190321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30700.

The product of its (nonzero) digits is 34992, while the sum is 42.

The square root of 998190321 is about 31594.1501072588. The cubic root of 998190321 is about 999.3964094184.

The spelling of 998190321 in words is "nine hundred ninety-eight million, one hundred ninety thousand, three hundred twenty-one".