3861440 has 56 divisors (see below), whose sum is σ = 10040112. Its totient is φ = 1402880.

The previous prime is 3861439. The next prime is 3861449. The reversal of 3861440 is 441683.

3861440 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3861449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2972 + ... + 4068.

Almost surely, 2^3861440 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 3861440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5020056).

3861440 is an abundant number, since it is smaller than the sum of its proper divisors (6178672).

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

3861440 is a wasteful number, since it uses less digits than its factorization.

3861440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1125 (or 1115 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 3861440 is about 1965.0547066176. The cubic root of 3861440 is about 156.8856050671.

The spelling of 3861440 in words is "three million, eight hundred sixty-one thousand, four hundred forty".