3946686840 has 192 divisors, whose sum is σ = 14089420800. Its totient is φ = 953669376.

The previous prime is 3946686839. The next prime is 3946686851. The reversal of 3946686840 is 486866493.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 144777 + ... + 169863.

It is an arithmetic number, because the mean of its divisors is an integer number (73382400).

Almost surely, 2^3946686840 is an apocalyptic number.

3946686840 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 3946686840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7044710400).

3946686840 is an abundant number, since it is smaller than the sum of its proper divisors (10142733960).

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

3946686840 is a wasteful number, since it uses less digits than its factorization.

3946686840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25146 (or 25139 counting only the distinct ones).

The product of its (nonzero) digits is 5971968, while the sum is 54.

The square root of 3946686840 is about 62822.6618347233. The cubic root of 3946686840 is about 1580.3170383399.

The spelling of 3946686840 in words is "three billion, nine hundred forty-six million, six hundred eighty-six thousand, eight hundred forty".