1000398 has 16 divisors (see below), whose sum is σ = 2286720. Its totient is φ = 285816.

The previous prime is 1000397. The next prime is 1000403. The reversal of 1000398 is 8930001.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000393) 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, 11868 + ... + 11951.

It is an arithmetic number, because the mean of its divisors is an integer number (142920).

2^1000398 is an apocalyptic number.

1000398 is an abundant number, since it is smaller than the sum of its proper divisors (1286322).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1000398 is a wasteful number, since it uses less digits than its factorization.

1000398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23831.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 1000398 is about 1000.1989802034. The cubic root of 1000398 is about 100.0132649070.

Adding to 1000398 its reverse (8930001), we get a palindrome (9930399).

It can be divided in two parts, 10003 and 98, that added together give a palindrome (10101).

The spelling of 1000398 in words is "one million, three hundred ninety-eight", and thus it is an aban number.