2406221 has 4 divisors (see below), whose sum is σ = 2471292. Its totient is φ = 2341152.

The previous prime is 2406199. The next prime is 2406227. The reversal of 2406221 is 1226042.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2208196 + 198025 = 1486^2 + 445^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2406221 is a prime.

It is a super-3 number, since 3×2406221³ = 41795333300439395583, which contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2406221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2406227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32480 + ... + 32553.

It is an arithmetic number, because the mean of its divisors is an integer number (617823).

2^2406221 is an apocalyptic number.

It is an amenable number.

2406221 is a deficient number, since it is larger than the sum of its proper divisors (65071).

2406221 is an equidigital number, since it uses as much as digits as its factorization.

2406221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65070.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 2406221 is about 1551.1998581743. The cubic root of 2406221 is about 134.0021719407.

The spelling of 2406221 in words is "two million, four hundred six thousand, two hundred twenty-one".