3946840 has 32 divisors (see below), whose sum is σ = 9000000. Its totient is φ = 1557504.

The previous prime is 3946837. The next prime is 3946843. The reversal of 3946840 is 486493.

3946840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (3946837) and next prime (3946843).

It is a junction number, because it is equal to n+sod(n) for n = 3946796 and 3946805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3946843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2536 + ... + 3784.

It is an arithmetic number, because the mean of its divisors is an integer number (281250).

Almost surely, 2^3946840 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 3946840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4500000).

3946840 is an abundant number, since it is smaller than the sum of its proper divisors (5053160).

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

3946840 is a wasteful number, since it uses less digits than its factorization.

3946840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1339 (or 1335 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 3946840 is about 1986.6655480981. The cubic root of 3946840 is about 158.0337480653.

The spelling of 3946840 in words is "three million, nine hundred forty-six thousand, eight hundred forty".