1242440377 has 2 divisors, whose sum is σ = 1242440378. Its totient is φ = 1242440376.

The previous prime is 1242440341. The next prime is 1242440389. The reversal of 1242440377 is 7730442421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 823460416 + 418979961 = 28696^2 + 20469^2 .

It is a cyclic number.

It is not a de Polignac number, because 1242440377 - 2⁷ = 1242440249 is a prime.

It is not a weakly prime, because it can be changed into another prime (1242440677) 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, 621220188 + 621220189.

It is an arithmetic number, because the mean of its divisors is an integer number (621220189).

Almost surely, 2^1242440377 is an apocalyptic number.

It is an amenable number.

1242440377 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242440377 is an equidigital number, since it uses as much as digits as its factorization.

1242440377 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 37632, while the sum is 34.

The square root of 1242440377 is about 35248.2677163006. The cubic root of 1242440377 is about 1075.0413907265.

Adding to 1242440377 its reverse (7730442421), we get a palindrome (8972882798).

The spelling of 1242440377 in words is "one billion, two hundred forty-two million, four hundred forty thousand, three hundred seventy-seven".