7213873 has 4 divisors (see below), whose sum is σ = 7219828. Its totient is φ = 7207920.

The previous prime is 7213861. The next prime is 7213897. The reversal of 7213873 is 3783127.

It is the 1097-th star number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 3783127 = 113 ⋅33479.

It can be written as a sum of positive squares in 2 ways, for example, as 5276209 + 1937664 = 2297^2 + 1392^2 .

It is a cyclic number.

It is not a de Polignac number, because 7213873 - 2⁵ = 7213841 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7213273) 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 3 ways as a sum of consecutive naturals, for example, 438 + ... + 3823.

It is an arithmetic number, because the mean of its divisors is an integer number (1804957).

Almost surely, 2^7213873 is an apocalyptic number.

It is an amenable number.

7213873 is a deficient number, since it is larger than the sum of its proper divisors (5955).

7213873 is a wasteful number, since it uses less digits than its factorization.

7213873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5954.

The product of its digits is 7056, while the sum is 31.

The square root of 7213873 is about 2685.8654098819. The cubic root of 7213873 is about 193.2218180390.

The spelling of 7213873 in words is "seven million, two hundred thirteen thousand, eight hundred seventy-three".