7213639 has 2 divisors, whose sum is σ = 7213640. Its totient is φ = 7213638.

The previous prime is 7213621. The next prime is 7213667. The reversal of 7213639 is 9363127.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 7213639 - 2¹¹ = 7211591 is a prime.

It is equal to p₄₉₀₁₈₉ and since 7213639 and 490189 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7213639.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7213699) 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 as a sum of consecutive naturals, namely, 3606819 + 3606820.

It is an arithmetic number, because the mean of its divisors is an integer number (3606820).

Almost surely, 2^7213639 is an apocalyptic number.

7213639 is a deficient number, since it is larger than the sum of its proper divisors (1).

7213639 is an equidigital number, since it uses as much as digits as its factorization.

7213639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6804, while the sum is 31.

The square root of 7213639 is about 2685.8218481500. The cubic root of 7213639 is about 193.2197288056.

The spelling of 7213639 in words is "seven million, two hundred thirteen thousand, six hundred thirty-nine".