3557840 has 80 divisors (see below), whose sum is σ = 9749376. Its totient is φ = 1190400.

The previous prime is 3557833. The next prime is 3557843. The reversal of 3557840 is 487553.

It is a happy number.

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

It is a nialpdrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 3557797 and 3557806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3557843) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11285 + ... + 11595.

Almost surely, 2^3557840 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 3557840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4874688).

3557840 is an abundant number, since it is smaller than the sum of its proper divisors (6191536).

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

3557840 is a wasteful number, since it uses less digits than its factorization.

3557840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348 (or 342 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 32.

The square root of 3557840 is about 1886.2237407052. The cubic root of 3557840 is about 152.6612466268.

It can be divided in two parts, 35 and 57840, that added together give a palindrome (57875).

The spelling of 3557840 in words is "three million, five hundred fifty-seven thousand, eight hundred forty".