1242136139 has 6 divisors (see below), whose sum is σ = 1276616124. Its totient is φ = 1208563560.

The previous prime is 1242136097. The next prime is 1242136151. The reversal of 1242136139 is 9316312421.

It is a de Polignac number, because none of the positive numbers 2^k-1242136139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1242136169) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 452297 + ... + 455034.

It is an arithmetic number, because the mean of its divisors is an integer number (212769354).

Almost surely, 2^1242136139 is an apocalyptic number.

1242136139 is a deficient number, since it is larger than the sum of its proper divisors (34479985).

1242136139 is an frugal number, since it uses more digits than its factorization.

1242136139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 907405 (or 907368 counting only the distinct ones).

The product of its digits is 7776, while the sum is 32.

The square root of 1242136139 is about 35243.9518073669. The cubic root of 1242136139 is about 1074.9536346327.

The spelling of 1242136139 in words is "one billion, two hundred forty-two million, one hundred thirty-six thousand, one hundred thirty-nine".