4391388 has 48 divisors (see below), whose sum is σ = 11561760. Its totient is φ = 1441152.

The previous prime is 4391371. The next prime is 4391393. The reversal of 4391388 is 8831934.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7606 + ... + 8162.

It is an arithmetic number, because the mean of its divisors is an integer number (240870).

Almost surely, 2^4391388 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 4391388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5780880).

4391388 is an abundant number, since it is smaller than the sum of its proper divisors (7170372).

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

4391388 is a wasteful number, since it uses less digits than its factorization.

4391388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 643 (or 635 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 4391388 is about 2095.5638859266. The cubic root of 4391388 is about 163.7572752823.

The spelling of 4391388 in words is "four million, three hundred ninety-one thousand, three hundred eighty-eight".