2381638 has 16 divisors (see below), whose sum is σ = 4103424. Its totient is φ = 1015560.

The previous prime is 2381633. The next prime is 2381651. The reversal of 2381638 is 8361832.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2381633) 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, 4081 + ... + 4627.

It is an arithmetic number, because the mean of its divisors is an integer number (256464).

2^2381638 is an apocalyptic number.

2381638 is a deficient number, since it is larger than the sum of its proper divisors (1721786).

2381638 is a wasteful number, since it uses less digits than its factorization.

2381638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 867.

The product of its digits is 6912, while the sum is 31.

The square root of 2381638 is about 1543.2556495928. The cubic root of 2381638 is about 133.5442675137.

The spelling of 2381638 in words is "two million, three hundred eighty-one thousand, six hundred thirty-eight".