3921408 has 120 divisors (see below), whose sum is σ = 12128688. Its totient is φ = 1216512.

The previous prime is 3921383. The next prime is 3921413. The reversal of 3921408 is 8041293.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 105966 + ... + 106002.

Almost surely, 2^3921408 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3921408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6064344).

3921408 is an abundant number, since it is smaller than the sum of its proper divisors (8207280).

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

3921408 is a wasteful number, since it uses less digits than its factorization.

3921408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84 (or 65 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 3921408 is about 1980.2545290947. The cubic root of 3921408 is about 157.6935790620.

Subtracting 3921408 from its reverse (8041293), we obtain a triangular number (4119885 = T₂₈₇₀).

The spelling of 3921408 in words is "three million, nine hundred twenty-one thousand, four hundred eight".