1242378829 has 2 divisors, whose sum is σ = 1242378830. Its totient is φ = 1242378828.

The previous prime is 1242378817. The next prime is 1242378877. The reversal of 1242378829 is 9288732421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 727542729 + 514836100 = 26973^2 + 22690^2 .

It is a cyclic number.

It is not a de Polignac number, because 1242378829 - 2⁷ = 1242378701 is a prime.

It is a super-2 number, since 2×1242378829² = 3087010309494822482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1242378889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621189414 + 621189415.

It is an arithmetic number, because the mean of its divisors is an integer number (621189415).

Almost surely, 2^1242378829 is an apocalyptic number.

It is an amenable number.

1242378829 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242378829 is an equidigital number, since it uses as much as digits as its factorization.

1242378829 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 387072, while the sum is 46.

The square root of 1242378829 is about 35247.3946413065. The cubic root of 1242378829 is about 1075.0236386365.

The spelling of 1242378829 in words is "one billion, two hundred forty-two million, three hundred seventy-eight thousand, eight hundred twenty-nine".