7440123989 has 2 divisors, whose sum is σ = 7440123990. Its totient is φ = 7440123988.

The previous prime is 7440123979. The next prime is 7440124007. The reversal of 7440123989 is 9893210447.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4008156100 + 3431967889 = 63310^2 + 58583^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7440123989 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7440123979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3720061994 + 3720061995.

It is an arithmetic number, because the mean of its divisors is an integer number (3720061995).

Almost surely, 2^7440123989 is an apocalyptic number.

It is an amenable number.

7440123989 is a deficient number, since it is larger than the sum of its proper divisors (1).

7440123989 is an equidigital number, since it uses as much as digits as its factorization.

7440123989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 435456, while the sum is 47.

The square root of 7440123989 is about 86256.1533399212. The cubic root of 7440123989 is about 1952.2108598703.

The spelling of 7440123989 in words is "seven billion, four hundred forty million, one hundred twenty-three thousand, nine hundred eighty-nine".