2198391 has 8 divisors (see below), whose sum is σ = 3156720. Its totient is φ = 1352832.

The previous prime is 2198377. The next prime is 2198401. The reversal of 2198391 is 1938912.

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

It is not a de Polignac number, because 2198391 - 2⁵ = 2198359 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2198191) 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, 28146 + ... + 28223.

It is an arithmetic number, because the mean of its divisors is an integer number (394590).

2^2198391 is an apocalyptic number.

2198391 is a deficient number, since it is larger than the sum of its proper divisors (958329).

2198391 is a wasteful number, since it uses less digits than its factorization.

2198391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56385.

The product of its digits is 3888, while the sum is 33.

The square root of 2198391 is about 1482.6972044217. The cubic root of 2198391 is about 130.0274301093.

The spelling of 2198391 in words is "two million, one hundred ninety-eight thousand, three hundred ninety-one".