1242340387 has 2 divisors, whose sum is σ = 1242340388. Its totient is φ = 1242340386.

The previous prime is 1242340373. The next prime is 1242340427. The reversal of 1242340387 is 7830432421.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1242340387 - 2⁷ = 1242340259 is a prime.

It is not a weakly prime, because it can be changed into another prime (1242340357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621170193 + 621170194.

It is an arithmetic number, because the mean of its divisors is an integer number (621170194).

Almost surely, 2^1242340387 is an apocalyptic number.

1242340387 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242340387 is an equidigital number, since it uses as much as digits as its factorization.

1242340387 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32256, while the sum is 34.

The square root of 1242340387 is about 35246.8493201875. The cubic root of 1242340387 is about 1075.0125506377.

The spelling of 1242340387 in words is "one billion, two hundred forty-two million, three hundred forty thousand, three hundred eighty-seven".