1001398 has 4 divisors (see below), whose sum is σ = 1502100. Its totient is φ = 500698.

The previous prime is 1001389. The next prime is 1001401. The reversal of 1001398 is 8931001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8931001 = 17 ⋅525353.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 250348 + ... + 250351.

It is an arithmetic number, because the mean of its divisors is an integer number (375525).

2^1001398 is an apocalyptic number.

1001398 is a deficient number, since it is larger than the sum of its proper divisors (500702).

1001398 is an equidigital number, since it uses as much as digits as its factorization.

1001398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 500701.

The product of its (nonzero) digits is 216, while the sum is 22.

The square root of 1001398 is about 1000.6987558701. The cubic root of 1001398 is about 100.0465783013.

Adding to 1001398 its reverse (8931001), we get a palindrome (9932399).

The spelling of 1001398 in words is "one million, one thousand, three hundred ninety-eight".