3545220 has 96 divisors (see below), whose sum is σ = 11870208. Its totient is φ = 772992.

The previous prime is 3545219. The next prime is 3545237. The reversal of 3545220 is 225453.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9477 + ... + 9843.

It is an arithmetic number, because the mean of its divisors is an integer number (123648).

Almost surely, 2^3545220 is an apocalyptic number.

3545220 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3545220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5935104).

3545220 is an abundant number, since it is smaller than the sum of its proper divisors (8324988).

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

3545220 is a wasteful number, since it uses less digits than its factorization.

3545220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409 (or 407 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 21.

The square root of 3545220 is about 1882.8754605656. The cubic root of 3545220 is about 152.4805314213.

The spelling of 3545220 in words is "three million, five hundred forty-five thousand, two hundred twenty".