1242639907 has 2 divisors, whose sum is σ = 1242639908. Its totient is φ = 1242639906.

The previous prime is 1242639859. The next prime is 1242639911. The reversal of 1242639907 is 7099362421.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1242639907 is a prime.

It is not a weakly prime, because it can be changed into another prime (1242649907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621319953 + 621319954.

It is an arithmetic number, because the mean of its divisors is an integer number (621319954).

Almost surely, 2^1242639907 is an apocalyptic number.

1242639907 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242639907 is an equidigital number, since it uses as much as digits as its factorization.

1242639907 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 163296, while the sum is 43.

The square root of 1242639907 is about 35251.0979545319. The cubic root of 1242639907 is about 1075.0989364864.

The spelling of 1242639907 in words is "one billion, two hundred forty-two million, six hundred thirty-nine thousand, nine hundred seven".