2155189 has 8 divisors (see below), whose sum is σ = 2303840. Its totient is φ = 2010096.

The previous prime is 2155187. The next prime is 2155201. The reversal of 2155189 is 9815512.

2155189 = T₂₄₆ + T₂₄₇ + ... + T₃₀₂.

2155189 = 77² + 78² + ... + 190².

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

It is a cyclic number.

It is not a de Polignac number, because 2155189 - 2¹ = 2155187 is a prime.

It is an Ulam number.

It is a Duffinian number.

2155189 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 2155189.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155183) 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, 427 + ... + 2119.

It is an arithmetic number, because the mean of its divisors is an integer number (287980).

2^2155189 is an apocalyptic number.

It is an amenable number.

2155189 is a deficient number, since it is larger than the sum of its proper divisors (148651).

2155189 is a wasteful number, since it uses less digits than its factorization.

2155189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1779.

The product of its digits is 3600, while the sum is 31.

The square root of 2155189 is about 1468.0561978344. The cubic root of 2155189 is about 129.1700379742.

The spelling of 2155189 in words is "two million, one hundred fifty-five thousand, one hundred eighty-nine".