2381890 has 24 divisors (see below), whose sum is σ = 4988412. Its totient is φ = 816480.

The previous prime is 2381881. The next prime is 2381891. The reversal of 2381890 is 981832.

It can be written as a sum of positive squares in 2 ways, for example, as 2307361 + 74529 = 1519^2 + 273^2 .

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

It is not an unprimeable number, because it can be changed into a prime (2381891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1941 + ... + 2920.

2^2381890 is an apocalyptic number.

2381890 is an abundant number, since it is smaller than the sum of its proper divisors (2606522).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2381890 is a wasteful number, since it uses less digits than its factorization.

2381890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4882 (or 4875 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 2381890 is about 1543.3372930115. The cubic root of 2381890 is about 133.5489774330.

The spelling of 2381890 in words is "two million, three hundred eighty-one thousand, eight hundred ninety".