1808135493 has 8 divisors (see below), whose sum is σ = 2411458656. Its totient is φ = 1205118000.

The previous prime is 1808135479. The next prime is 1808135503. The reversal of 1808135493 is 3945318081.

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

It is not a de Polignac number, because 1808135493 - 2⁶ = 1808135429 is a prime.

It is a super-2 number, since 2×1808135493² = 6538707922092706098, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1808133493) 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, 62238 + ... + 86543.

It is an arithmetic number, because the mean of its divisors is an integer number (301432332).

Almost surely, 2^1808135493 is an apocalyptic number.

It is an amenable number.

1808135493 is a deficient number, since it is larger than the sum of its proper divisors (603323163).

1808135493 is a wasteful number, since it uses less digits than its factorization.

1808135493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152835.

The product of its (nonzero) digits is 103680, while the sum is 42.

The square root of 1808135493 is about 42522.1764847473. The cubic root of 1808135493 is about 1218.2703009881.

The spelling of 1808135493 in words is "one billion, eight hundred eight million, one hundred thirty-five thousand, four hundred ninety-three".