3221370 has 80 divisors (see below), whose sum is σ = 8964648. Its totient is φ = 829440.

The previous prime is 3221359. The next prime is 3221371. The reversal of 3221370 is 731223.

It can be written as a sum of positive squares in 4 ways, for example, as 1656369 + 1565001 = 1287^2 + 1251^2 .

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

It is not an unprimeable number, because it can be changed into a prime (3221371) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 33162 + ... + 33258.

Almost surely, 2^3221370 is an apocalyptic number.

3221370 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 3221370, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4482324).

3221370 is an abundant number, since it is smaller than the sum of its proper divisors (5743278).

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

3221370 is a wasteful number, since it uses less digits than its factorization.

3221370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157 (or 148 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 18.

The square root of 3221370 is about 1794.8175394730. The cubic root of 3221370 is about 147.6885647339.

Adding to 3221370 its reverse (731223), we get a palindrome (3952593).

The spelling of 3221370 in words is "three million, two hundred twenty-one thousand, three hundred seventy".