1242040069 has 2 divisors, whose sum is σ = 1242040070. Its totient is φ = 1242040068.

The previous prime is 1242040049. The next prime is 1242040073. The reversal of 1242040069 is 9600402421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1014422500 + 227617569 = 31850^2 + 15087^2 .

It is a cyclic number.

It is not a de Polignac number, because 1242040069 - 2²⁵ = 1208485637 is a prime.

It is a super-2 number, since 2×1242040069² = 3085327066003049522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1242040049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621020034 + 621020035.

It is an arithmetic number, because the mean of its divisors is an integer number (621020035).

Almost surely, 2^1242040069 is an apocalyptic number.

It is an amenable number.

1242040069 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242040069 is an equidigital number, since it uses as much as digits as its factorization.

1242040069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 1242040069 is about 35242.5888521261. The cubic root of 1242040069 is about 1074.9259206930.

The spelling of 1242040069 in words is "one billion, two hundred forty-two million, forty thousand, sixty-nine".