3878638 has 8 divisors (see below), whose sum is σ = 5837832. Its totient is φ = 1932696.

The previous prime is 3878629. The next prime is 3878647. The reversal of 3878638 is 8368783.

It is an interprime number because it is at equal distance from previous prime (3878629) and next prime (3878647).

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

It is a junction number, because it is equal to n+sod(n) for n = 3878594 and 3878603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2545 + ... + 3772.

It is an arithmetic number, because the mean of its divisors is an integer number (729729).

Almost surely, 2^3878638 is an apocalyptic number.

3878638 is a deficient number, since it is larger than the sum of its proper divisors (1959194).

3878638 is a wasteful number, since it uses less digits than its factorization.

3878638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6626.

The product of its digits is 193536, while the sum is 43.

The square root of 3878638 is about 1969.4258046446. The cubic root of 3878638 is about 157.1181714076.

It can be divided in two parts, 387 and 8638, that added together give a square (9025 = 95²).

The spelling of 3878638 in words is "three million, eight hundred seventy-eight thousand, six hundred thirty-eight".