998407 has 8 divisors (see below), whose sum is σ = 1056384. Its totient is φ = 941688.

The previous prime is 998399. The next prime is 998411. The reversal of 998407 is 704899.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 998407 - 2³ = 998399 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1648 + ... + 2170.

It is an arithmetic number, because the mean of its divisors is an integer number (132048).

2⁹⁹⁸⁴⁰⁷ is an apocalyptic number.

998407 is a deficient number, since it is larger than the sum of its proper divisors (57977).

998407 is a wasteful number, since it uses less digits than its factorization.

998407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 629.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 998407 is about 999.2031825410. The cubic root of 998407 is about 99.9468717789.

The spelling of 998407 in words is "nine hundred ninety-eight thousand, four hundred seven".