1243908139 has 8 divisors (see below), whose sum is σ = 1359566208. Its totient is φ = 1132970880.

The previous prime is 1243908121. The next prime is 1243908161. The reversal of 1243908139 is 9318093421.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1243908139 - 2¹⁵ = 1243875371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1243908119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1179652 + ... + 1180705.

It is an arithmetic number, because the mean of its divisors is an integer number (169945776).

Almost surely, 2^1243908139 is an apocalyptic number.

1243908139 is a deficient number, since it is larger than the sum of its proper divisors (115658069).

1243908139 is a wasteful number, since it uses less digits than its factorization.

1243908139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2360405.

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 1243908139 is about 35269.0819131998. The cubic root of 1243908139 is about 1075.4645589749.

The spelling of 1243908139 in words is "one billion, two hundred forty-three million, nine hundred eight thousand, one hundred thirty-nine".