2189858 has 12 divisors (see below), whose sum is σ = 3610950. Its totient is φ = 995280.

The previous prime is 2189843. The next prime is 2189867. The reversal of 2189858 is 8589812.

It can be written as a sum of positive squares in only one way, i.e., 1545049 + 644809 = 1243^2 + 803^2 .

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4283 + ... + 4766.

2^2189858 is an apocalyptic number.

2189858 is a deficient number, since it is larger than the sum of its proper divisors (1421092).

2189858 is a wasteful number, since it uses less digits than its factorization.

2189858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9073 (or 9062 counting only the distinct ones).

The product of its digits is 46080, while the sum is 41.

The square root of 2189858 is about 1479.8168805633. The cubic root of 2189858 is about 129.8589792294.

The spelling of 2189858 in words is "two million, one hundred eighty-nine thousand, eight hundred fifty-eight".