1808289690 has 16 divisors (see below), whose sum is σ = 4339895328. Its totient is φ = 482210576.

The previous prime is 1808289667. The next prime is 1808289713. The reversal of 1808289690 is 969828081.

It is an interprime number because it is at equal distance from previous prime (1808289667) and next prime (1808289713).

It is a super-2 number, since 2×1808289690² = 6539823205920592200, which contains 22 as substring.

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, 30138132 + ... + 30138191.

It is an arithmetic number, because the mean of its divisors is an integer number (271243458).

Almost surely, 2^1808289690 is an apocalyptic number.

1808289690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1808289690 is an abundant number, since it is smaller than the sum of its proper divisors (2531605638).

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

1808289690 is a wasteful number, since it uses less digits than its factorization.

1808289690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60276333.

The product of its (nonzero) digits is 497664, while the sum is 51.

The square root of 1808289690 is about 42523.9895823522. The cubic root of 1808289690 is about 1218.3049311890.

The spelling of 1808289690 in words is "one billion, eight hundred eight million, two hundred eighty-nine thousand, six hundred ninety".