3521250 has 60 divisors (see below), whose sum is σ = 9564126. Its totient is φ = 936000.

The previous prime is 3521249. The next prime is 3521257. The reversal of 3521250 is 521253.

It is a happy number.

It can be written as a sum of positive squares in 5 ways, for example, as 205209 + 3316041 = 453^2 + 1821^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3521257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 11094 + ... + 11406.

Almost surely, 2^3521250 is an apocalyptic number.

3521250 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 3521250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4782063).

3521250 is an abundant number, since it is smaller than the sum of its proper divisors (6042876).

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

3521250 is a wasteful number, since it uses less digits than its factorization.

3521250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341 (or 323 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The square root of 3521250 is about 1876.4994004795. The cubic root of 3521250 is about 152.1361027031.

3521250 divided by its sum of digits (18) gives a triangular number (195625 = T₆₂₅).

The spelling of 3521250 in words is "three million, five hundred twenty-one thousand, two hundred fifty".