7213247 has 4 divisors (see below), whose sum is σ = 7349400. Its totient is φ = 7077096.

The previous prime is 7213243. The next prime is 7213273. The reversal of 7213247 is 7423127.

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

It is a cyclic number.

It is not a de Polignac number, because 7213247 - 2² = 7213243 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7213243) 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 3 ways as a sum of consecutive naturals, for example, 67997 + ... + 68102.

It is an arithmetic number, because the mean of its divisors is an integer number (1837350).

Almost surely, 2^7213247 is an apocalyptic number.

7213247 is a deficient number, since it is larger than the sum of its proper divisors (136153).

7213247 is a wasteful number, since it uses less digits than its factorization.

7213247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136152.

The product of its digits is 2352, while the sum is 26.

The square root of 7213247 is about 2685.7488713579. The cubic root of 7213247 is about 193.2162287919.

The spelling of 7213247 in words is "seven million, two hundred thirteen thousand, two hundred forty-seven".