2001398 has 16 divisors (see below), whose sum is σ = 3490560. Its totient is φ = 842856.

The previous prime is 2001397. The next prime is 2001407. The reversal of 2001398 is 8931002.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001397) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 386 + ... + 2037.

It is an arithmetic number, because the mean of its divisors is an integer number (218160).

2^2001398 is an apocalyptic number.

2001398 is a deficient number, since it is larger than the sum of its proper divisors (1489162).

2001398 is a wasteful number, since it uses less digits than its factorization.

2001398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2491.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 2001398 is about 1414.7077436700. The cubic root of 2001398 is about 126.0214543126.

The spelling of 2001398 in words is "two million, one thousand, three hundred ninety-eight".