7213740 has 48 divisors (see below), whose sum is σ = 20321280. Its totient is φ = 1912000.

The previous prime is 7213709. The next prime is 7213747. The reversal of 7213740 is 473127.

It is a nialpdrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 7213740.

It is not an unprimeable number, because it can be changed into a prime (7213747) 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, 14821 + ... + 15299.

It is an arithmetic number, because the mean of its divisors is an integer number (423360).

Almost surely, 2^7213740 is an apocalyptic number.

It is an amenable number.

7213740 is an abundant number, since it is smaller than the sum of its proper divisors (13107540).

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

7213740 is a wasteful number, since it uses less digits than its factorization.

7213740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 742 (or 740 counting only the distinct ones).

The product of its (nonzero) digits is 1176, while the sum is 24.

The square root of 7213740 is about 2685.8406505227. The cubic root of 7213740 is about 193.2206305743.

Adding to 7213740 its reverse (473127), we get a palindrome (7686867).

The spelling of 7213740 in words is "seven million, two hundred thirteen thousand, seven hundred forty".