3928638 has 32 divisors (see below), whose sum is σ = 9089280. Its totient is φ = 1108800.

The previous prime is 3928637. The next prime is 3928651. The reversal of 3928638 is 8368293.

Its product of digits (62208) is a multiple of the sum of its prime divisors (1152).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 3928596 and 3928605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3928637) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3213 + ... + 4263.

It is an arithmetic number, because the mean of its divisors is an integer number (284040).

Almost surely, 2^3928638 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3928638, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4544640).

3928638 is an abundant number, since it is smaller than the sum of its proper divisors (5160642).

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

3928638 is a wasteful number, since it uses less digits than its factorization.

3928638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1152.

The product of its digits is 62208, while the sum is 39.

The square root of 3928638 is about 1982.0792113334. The cubic root of 3928638 is about 157.7904341203.

The spelling of 3928638 in words is "three million, nine hundred twenty-eight thousand, six hundred thirty-eight".