3821840 has 80 divisors (see below), whose sum is σ = 10017216. Its totient is φ = 1344000.

The previous prime is 3821837. The next prime is 3821863. The reversal of 3821840 is 481283.

3821840 = 11² + 12² + ... + 225².

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37790 + ... + 37890.

Almost surely, 2^3821840 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 3821840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5008608).

3821840 is an abundant number, since it is smaller than the sum of its proper divisors (6195376).

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

3821840 is a wasteful number, since it uses less digits than its factorization.

3821840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168 (or 162 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 3821840 is about 1954.9526848494. The cubic root of 3821840 is about 156.3474613289.

It can be divided in two parts, 382 and 1840, that added together give a palindrome (2222).

The spelling of 3821840 in words is "three million, eight hundred twenty-one thousand, eight hundred forty".