1240842269 has 2 divisors, whose sum is σ = 1240842270. Its totient is φ = 1240842268.

The previous prime is 1240842233. The next prime is 1240842283. The reversal of 1240842269 is 9622480421.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1208466169 + 32376100 = 34763^2 + 5690^2 .

It is a cyclic number.

It is not a de Polignac number, because 1240842269 - 2²⁴ = 1224065053 is a prime.

It is a super-2 number, since 2×1240842269² = 3079379073074136722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1240892269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 620421134 + 620421135.

It is an arithmetic number, because the mean of its divisors is an integer number (620421135).

Almost surely, 2^1240842269 is an apocalyptic number.

It is an amenable number.

1240842269 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240842269 is an equidigital number, since it uses as much as digits as its factorization.

1240842269 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 55296, while the sum is 38.

The square root of 1240842269 is about 35225.5911093057. The cubic root of 1240842269 is about 1074.5802634642.

The spelling of 1240842269 in words is "one billion, two hundred forty million, eight hundred forty-two thousand, two hundred sixty-nine".