3899840 has 56 divisors (see below), whose sum is σ = 10619232. Its totient is φ = 1336320.

The previous prime is 3899839. The next prime is 3899843. The reversal of 3899840 is 489983.

It is a tau number, because it is divible by the number of its divisors (56).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3899843) 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, 1370 + ... + 3110.

Almost surely, 2^3899840 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 3899840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5309616).

3899840 is an abundant number, since it is smaller than the sum of its proper divisors (6719392).

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

3899840 is a wasteful number, since it uses less digits than its factorization.

3899840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1765 (or 1755 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 3899840 is about 1974.8012558230. The cubic root of 3899840 is about 157.4039390718.

The spelling of 3899840 in words is "three million, eight hundred ninety-nine thousand, eight hundred forty".