1808135139 has 8 divisors (see below), whose sum is σ = 2411612352. Its totient is φ = 1205040680.

The previous prime is 1808135117. The next prime is 1808135143. The reversal of 1808135139 is 9315318081.

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 1808135139 - 2²⁸ = 1539699683 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1808135097 and 1808135106.

It is not an unprimeable number, because it can be changed into a prime (1808135149) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84477 + ... + 103694.

It is an arithmetic number, because the mean of its divisors is an integer number (301451544).

Almost surely, 2^1808135139 is an apocalyptic number.

1808135139 is a deficient number, since it is larger than the sum of its proper divisors (603477213).

1808135139 is a wasteful number, since it uses less digits than its factorization.

1808135139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191377.

The product of its (nonzero) digits is 25920, while the sum is 39.

The square root of 1808135139 is about 42522.1723222133. The cubic root of 1808135139 is about 1218.2702214831.

The spelling of 1808135139 in words is "one billion, eight hundred eight million, one hundred thirty-five thousand, one hundred thirty-nine".