1240204311389 has 2 divisors, whose sum is σ = 1240204311390. Its totient is φ = 1240204311388.

The previous prime is 1240204311349. The next prime is 1240204311439. The reversal of 1240204311389 is 9831134020421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1238584248889 + 1620062500 = 1112917^2 + 40250^2 .

It is a cyclic number.

It is not a de Polignac number, because 1240204311389 - 2¹⁶ = 1240204245853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1240204311349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 620102155694 + 620102155695.

It is an arithmetic number, because the mean of its divisors is an integer number (620102155695).

Almost surely, 2^{1240204311389} is an apocalyptic number.

It is an amenable number.

1240204311389 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240204311389 is an equidigital number, since it uses as much as digits as its factorization.

1240204311389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 38.

The spelling of 1240204311389 in words is "one trillion, two hundred forty billion, two hundred four million, three hundred eleven thousand, three hundred eighty-nine".