998801409 has 4 divisors (see below), whose sum is σ = 1331735216. Its totient is φ = 665867604.

The previous prime is 998801407. The next prime is 998801411. The reversal of 998801409 is 904108899.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (998801407) and next prime (998801411).

It is not a de Polignac number, because 998801409 - 2¹ = 998801407 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (998801407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166466899 + ... + 166466904.

It is an arithmetic number, because the mean of its divisors is an integer number (332933804).

It is a Proth number, since it is equal to 30481 ⋅ 2¹⁵ + 1 and 30481 < 2¹⁵.

Almost surely, 2^998801409 is an apocalyptic number.

It is an amenable number.

998801409 is a deficient number, since it is larger than the sum of its proper divisors (332933807).

998801409 is a wasteful number, since it uses less digits than its factorization.

998801409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332933806.

The product of its (nonzero) digits is 186624, while the sum is 48.

The square root of 998801409 is about 31603.8195318224. The cubic root of 998801409 is about 999.6003099358.

The spelling of 998801409 in words is "nine hundred ninety-eight million, eight hundred one thousand, four hundred nine".