1808136840 has 32 divisors (see below), whose sum is σ = 5424410880. Its totient is φ = 482169792.

The previous prime is 1808136829. The next prime is 1808136853. The reversal of 1808136840 is 486318081.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7533784 + ... + 7534023.

It is an arithmetic number, because the mean of its divisors is an integer number (169512840).

Almost surely, 2^1808136840 is an apocalyptic number.

1808136840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1808136840 is an abundant number, since it is smaller than the sum of its proper divisors (3616274040).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1808136840 is a wasteful number, since it uses less digits than its factorization.

1808136840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15067821 (or 15067817 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 39.

The square root of 1808136840 is about 42522.1923235385. The cubic root of 1808136840 is about 1218.2706035115.

The spelling of 1808136840 in words is "one billion, eight hundred eight million, one hundred thirty-six thousand, eight hundred forty".