998336421 has 10 divisors (see below), whose sum is σ = 1491342182. Its totient is φ = 665557560.

The previous prime is 998336411. The next prime is 998336473. The reversal of 998336421 is 124633899.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 997928100 + 408321 = 31590^2 + 639^2 .

It is not a de Polignac number, because 998336421 - 2⁵ = 998336389 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 (998336411) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 6162490 + ... + 6162651.

Almost surely, 2^998336421 is an apocalyptic number.

It is an amenable number.

998336421 is a deficient number, since it is larger than the sum of its proper divisors (493005761).

998336421 is a wasteful number, since it uses less digits than its factorization.

998336421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12325153 (or 12325144 counting only the distinct ones).

The product of its digits is 279936, while the sum is 45.

The square root of 998336421 is about 31596.4621595520. The cubic root of 998336421 is about 999.4451658827.

The spelling of 998336421 in words is "nine hundred ninety-eight million, three hundred thirty-six thousand, four hundred twenty-one".