3859840 has 64 divisors (see below), whose sum is σ = 9534960. Its totient is φ = 1492992.

The previous prime is 3859829. The next prime is 3859847. The reversal of 3859840 is 489583.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a self number, because there is not a number n which added to its sum of digits gives 3859840.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3859847) 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, 23599 + ... + 23761.

Almost surely, 2^3859840 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 3859840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4767480).

3859840 is an abundant number, since it is smaller than the sum of its proper divisors (5675120).

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

3859840 is a wasteful number, since it uses less digits than its factorization.

3859840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219 (or 207 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 3859840 is about 1964.6475510890. The cubic root of 3859840 is about 156.8639333897.

The spelling of 3859840 in words is "three million, eight hundred fifty-nine thousand, eight hundred forty".