420998 has 4 divisors (see below), whose sum is σ = 631500. Its totient is φ = 210498.

The previous prime is 420997. The next prime is 421009. The reversal of 420998 is 899024.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105248 + ... + 105251.

It is an arithmetic number, because the mean of its divisors is an integer number (157875).

2⁴²⁰⁹⁹⁸ is an apocalyptic number.

420998 is a deficient number, since it is larger than the sum of its proper divisors (210502).

420998 is a wasteful number, since it uses less digits than its factorization.

420998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210501.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 420998 is about 648.8435866987. The cubic root of 420998 is about 74.9479935757.

The spelling of 420998 in words is "four hundred twenty thousand, nine hundred ninety-eight".