3551856 has 120 divisors (see below), whose sum is σ = 11820672. Its totient is φ = 892800.

The previous prime is 3551851. The next prime is 3551881. The reversal of 3551856 is 6581553.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3551851) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 114561 + ... + 114591.

Almost surely, 2^3551856 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 3551856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5910336).

3551856 is an abundant number, since it is smaller than the sum of its proper divisors (8268816).

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

3551856 is a wasteful number, since it uses less digits than its factorization.

3551856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91 (or 54 counting only the distinct ones).

The product of its digits is 18000, while the sum is 33.

The square root of 3551856 is about 1884.6368350428. The cubic root of 3551856 is about 152.5756106288.

It can be divided in two parts, 355 and 1856, that added together give a triangular number (2211 = T₆₆).

The spelling of 3551856 in words is "three million, five hundred fifty-one thousand, eight hundred fifty-six".