7213866 has 32 divisors (see below), whose sum is σ = 16286400. Its totient is φ = 2110080.

The previous prime is 7213861. The next prime is 7213897. The reversal of 7213866 is 6683127.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (7213861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30 + ... + 3798.

It is an arithmetic number, because the mean of its divisors is an integer number (508950).

Almost surely, 2^7213866 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7213866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8143200).

7213866 is an abundant number, since it is smaller than the sum of its proper divisors (9072534).

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

7213866 is a wasteful number, since it uses less digits than its factorization.

7213866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3814.

The product of its digits is 12096, while the sum is 33.

The square root of 7213866 is about 2685.8641067634. The cubic root of 7213866 is about 193.2217555413.

The spelling of 7213866 in words is "seven million, two hundred thirteen thousand, eight hundred sixty-six".