998457 has 8 divisors (see below), whose sum is σ = 1354080. Its totient is φ = 654240.

The previous prime is 998443. The next prime is 998471. The reversal of 998457 is 754899.

It is an interprime number because it is at equal distance from previous prime (998443) and next prime (998471).

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

It is not a de Polignac number, because 998457 - 2⁷ = 998329 is a prime.

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

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2644 + ... + 2997.

It is an arithmetic number, because the mean of its divisors is an integer number (169260).

2⁹⁹⁸⁴⁵⁷ is an apocalyptic number.

It is an amenable number.

998457 is a deficient number, since it is larger than the sum of its proper divisors (355623).

998457 is a wasteful number, since it uses less digits than its factorization.

998457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5703.

The product of its digits is 90720, while the sum is 42.

The square root of 998457 is about 999.2282021641. The cubic root of 998457 is about 99.9485401901.

The spelling of 998457 in words is "nine hundred ninety-eight thousand, four hundred fifty-seven".