3894840 has 96 divisors (see below), whose sum is σ = 13104000. Its totient is φ = 1002240.

The previous prime is 3894833. The next prime is 3894857. The reversal of 3894840 is 484983.

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

It is a junction number, because it is equal to n+sod(n) for n = 3894795 and 3894804.

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 in 23 ways as a sum of consecutive naturals, for example, 10986 + ... + 11334.

It is an arithmetic number, because the mean of its divisors is an integer number (136500).

Almost surely, 2^3894840 is an apocalyptic number.

3894840 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3894840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6552000).

3894840 is an abundant number, since it is smaller than the sum of its proper divisors (9209160).

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

3894840 is a wasteful number, since it uses less digits than its factorization.

3894840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397 (or 390 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 3894840 is about 1973.5348996154. The cubic root of 3894840 is about 157.3366409021.

The spelling of 3894840 in words is "three million, eight hundred ninety-four thousand, eight hundred forty".