1240203973 has 2 divisors, whose sum is σ = 1240203974. Its totient is φ = 1240203972.

The previous prime is 1240203971. The next prime is 1240203977. The reversal of 1240203973 is 3793020421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 858314209 + 381889764 = 29297^2 + 19542^2 .

It is an emirp because it is prime and its reverse (3793020421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1240203973 - 2¹ = 1240203971 is a prime.

Together with 1240203971, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1240203971) 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 as a sum of consecutive naturals, namely, 620101986 + 620101987.

It is an arithmetic number, because the mean of its divisors is an integer number (620101987).

Almost surely, 2^1240203973 is an apocalyptic number.

It is an amenable number.

1240203973 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240203973 is an equidigital number, since it uses as much as digits as its factorization.

1240203973 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 1240203973 is about 35216.5298262052. The cubic root of 1240203973 is about 1074.3959752204.

The spelling of 1240203973 in words is "one billion, two hundred forty million, two hundred three thousand, nine hundred seventy-three".