3847640 has 32 divisors (see below), whose sum is σ = 8862480. Its totient is φ = 1502592.

The previous prime is 3847639. The next prime is 3847651. The reversal of 3847640 is 467483.

It is a happy number.

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors.

It is a plaindrome in base 12.

It is a junction number, because it is equal to n+sod(n) for n = 3847597 and 3847606.

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 7 ways as a sum of consecutive naturals, for example, 602 + ... + 2838.

Almost surely, 2^3847640 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 3847640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4431240).

3847640 is an abundant number, since it is smaller than the sum of its proper divisors (5014840).

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

3847640 is a wasteful number, since it uses less digits than its factorization.

3847640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2291 (or 2287 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 3847640 is about 1961.5402111606. The cubic root of 3847640 is about 156.6984895870.

The spelling of 3847640 in words is "three million, eight hundred forty-seven thousand, six hundred forty".