1240203997 has 2 divisors, whose sum is σ = 1240203998. Its totient is φ = 1240203996.

The previous prime is 1240203989. The next prime is 1240204001. The reversal of 1240203997 is 7993020421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1209578841 + 30625156 = 34779^2 + 5534^2 .

It is a cyclic number.

It is not a de Polignac number, because 1240203997 - 2³ = 1240203989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1240203917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 620101998 + 620101999.

It is an arithmetic number, because the mean of its divisors is an integer number (620101999).

Almost surely, 2^1240203997 is an apocalyptic number.

It is an amenable number.

1240203997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240203997 is an equidigital number, since it uses as much as digits as its factorization.

1240203997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 1240203997 is about 35216.5301669543. The cubic root of 1240203997 is about 1074.3959821509.

The spelling of 1240203997 in words is "one billion, two hundred forty million, two hundred three thousand, nine hundred ninety-seven".