1023998 has 8 divisors (see below), whose sum is σ = 1555680. Its totient is φ = 505440.

The previous prime is 1023991. The next prime is 1024021. The reversal of 1023998 is 8993201.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1023991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3083 + ... + 3398.

It is an arithmetic number, because the mean of its divisors is an integer number (194460).

2^1023998 is an apocalyptic number.

1023998 is a deficient number, since it is larger than the sum of its proper divisors (531682).

1023998 is an equidigital number, since it uses as much as digits as its factorization.

1023998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6562.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 1023998 is about 1011.9278630416. The cubic root of 1023998 is about 100.7936183707.

The spelling of 1023998 in words is "one million, twenty-three thousand, nine hundred ninety-eight".