1240400297 has 2 divisors, whose sum is σ = 1240400298. Its totient is φ = 1240400296.

The previous prime is 1240400197. The next prime is 1240400309. The reversal of 1240400297 is 7920040421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1181709376 + 58690921 = 34376^2 + 7661^2 .

It is a cyclic number.

It is not a de Polignac number, because 1240400297 - 2¹⁰ = 1240399273 is a prime.

It is not a weakly prime, because it can be changed into another prime (1240400197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 620200148 + 620200149.

It is an arithmetic number, because the mean of its divisors is an integer number (620200149).

Almost surely, 2^1240400297 is an apocalyptic number.

It is an amenable number.

1240400297 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240400297 is an equidigital number, since it uses as much as digits as its factorization.

1240400297 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 1240400297 is about 35219.3171001370. The cubic root of 1240400297 is about 1074.4526644401.

The spelling of 1240400297 in words is "one billion, two hundred forty million, four hundred thousand, two hundred ninety-seven".