7217406 has 60 divisors (see below), whose sum is σ = 18352152. Its totient is φ = 2049768.

The previous prime is 7217369. The next prime is 7217407. The reversal of 7217406 is 6047127.

It is a self number, because there is not a number n which added to its sum of digits gives 7217406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7217407) 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, 43135 + ... + 43301.

Almost surely, 2^7217406 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7217406, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9176076).

7217406 is an abundant number, since it is smaller than the sum of its proper divisors (11134746).

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

7217406 is a wasteful number, since it uses less digits than its factorization.

7217406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203 (or 179 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 27.

The square root of 7217406 is about 2686.5230317271. The cubic root of 7217406 is about 193.2533564036.

The spelling of 7217406 in words is "seven million, two hundred seventeen thousand, four hundred six".