3867638 has 4 divisors (see below), whose sum is σ = 5801460. Its totient is φ = 1933818.

The previous prime is 3867629. The next prime is 3867649. The reversal of 3867638 is 8367683.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 3867595 and 3867604.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 966908 + ... + 966911.

It is an arithmetic number, because the mean of its divisors is an integer number (1450365).

Almost surely, 2^3867638 is an apocalyptic number.

3867638 is a deficient number, since it is larger than the sum of its proper divisors (1933822).

3867638 is a wasteful number, since it uses less digits than its factorization.

3867638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1933821.

The product of its digits is 145152, while the sum is 41.

The square root of 3867638 is about 1966.6311296224. The cubic root of 3867638 is about 156.9694992611.

It can be divided in two parts, 38 and 67638, that added together give a palindrome (67676).

The spelling of 3867638 in words is "three million, eight hundred sixty-seven thousand, six hundred thirty-eight".