3551920 has 40 divisors (see below), whose sum is σ = 8548560. Its totient is φ = 1370880.

The previous prime is 3551909. The next prime is 3551921. The reversal of 3551920 is 291553.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×3551920² = 25232271372800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (3551921) 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, 1555 + ... + 3085.

It is an arithmetic number, because the mean of its divisors is an integer number (213714).

Almost surely, 2^3551920 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 3551920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4274280).

3551920 is an abundant number, since it is smaller than the sum of its proper divisors (4996640).

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

3551920 is a wasteful number, since it uses less digits than its factorization.

3551920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1573 (or 1567 counting only the distinct ones).

The product of its (nonzero) digits is 1350, while the sum is 25.

The square root of 3551920 is about 1884.6538143649. The cubic root of 3551920 is about 152.5765270304.

The spelling of 3551920 in words is "three million, five hundred fifty-one thousand, nine hundred twenty".