2091398 has 8 divisors (see below), whose sum is σ = 3150840. Its totient is φ = 1041120.

The previous prime is 2091389. The next prime is 2091409. The reversal of 2091398 is 8931902.

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

It is an Ulam number.

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 in 3 ways as a sum of consecutive naturals, for example, 1688 + ... + 2651.

It is an arithmetic number, because the mean of its divisors is an integer number (393855).

2^2091398 is an apocalyptic number.

2091398 is a deficient number, since it is larger than the sum of its proper divisors (1059442).

2091398 is a wasteful number, since it uses less digits than its factorization.

2091398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4582.

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

The square root of 2091398 is about 1446.1666570627. The cubic root of 2091398 is about 127.8828273419.

The spelling of 2091398 in words is "two million, ninety-one thousand, three hundred ninety-eight".