3518221 has 12 divisors (see below), whose sum is σ = 4162656. Its totient is φ = 2912760.

The previous prime is 3518209. The next prime is 3518227. The reversal of 3518221 is 1228153.

It is not a de Polignac number, because 3518221 - 2¹³ = 3510029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3518192 and 3518201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3518227) 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 11 ways as a sum of consecutive naturals, for example, 6466 + ... + 6988.

It is an arithmetic number, because the mean of its divisors is an integer number (346888).

Almost surely, 2^3518221 is an apocalyptic number.

3518221 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

3518221 is a deficient number, since it is larger than the sum of its proper divisors (644435).

3518221 is an equidigital number, since it uses as much as digits as its factorization.

3518221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 592 (or 561 counting only the distinct ones).

The product of its digits is 480, while the sum is 22.

The square root of 3518221 is about 1875.6921389183. The cubic root of 3518221 is about 152.0924673983.

The spelling of 3518221 in words is "three million, five hundred eighteen thousand, two hundred twenty-one".