7218840737 has 2 divisors, whose sum is σ = 7218840738. Its totient is φ = 7218840736.

The previous prime is 7218840703. The next prime is 7218840793. The reversal of 7218840737 is 7370488127.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5726100241 + 1492740496 = 75671^2 + 38636^2 .

It is a cyclic number.

It is not a de Polignac number, because 7218840737 - 2²⁸ = 6950405281 is a prime.

It is a super-2 number, since 2×7218840737² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 7218840691 and 7218840700.

It is not a weakly prime, because it can be changed into another prime (7218840137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3609420368 + 3609420369.

It is an arithmetic number, because the mean of its divisors is an integer number (3609420369).

Almost surely, 2^7218840737 is an apocalyptic number.

It is an amenable number.

7218840737 is a deficient number, since it is larger than the sum of its proper divisors (1).

7218840737 is an equidigital number, since it uses as much as digits as its factorization.

7218840737 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 526848, while the sum is 47.

The square root of 7218840737 is about 84963.7613162223. The cubic root of 7218840737 is about 1932.6616106734.

The spelling of 7218840737 in words is "seven billion, two hundred eighteen million, eight hundred forty thousand, seven hundred thirty-seven".