1242119839 has 2 divisors, whose sum is σ = 1242119840. Its totient is φ = 1242119838.

The previous prime is 1242119833. The next prime is 1242119863. The reversal of 1242119839 is 9389112421.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1242119839 - 2³ = 1242119831 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1242119831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621059919 + 621059920.

It is an arithmetic number, because the mean of its divisors is an integer number (621059920).

Almost surely, 2^1242119839 is an apocalyptic number.

1242119839 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242119839 is an equidigital number, since it uses as much as digits as its factorization.

1242119839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 40.

The square root of 1242119839 is about 35243.7205612574. The cubic root of 1242119839 is about 1074.9489325660.

The spelling of 1242119839 in words is "one billion, two hundred forty-two million, one hundred nineteen thousand, eight hundred thirty-nine".