1806918840 has 96 divisors (see below), whose sum is σ = 6090018480. Its totient is φ = 481842432.

The previous prime is 1806918823. The next prime is 1806918853. The reversal of 1806918840 is 488196081.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

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 23 ways as a sum of consecutive naturals, for example, 83229 + ... + 102668.

Almost surely, 2^1806918840 is an apocalyptic number.

1806918840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1806918840 is an abundant number, since it is smaller than the sum of its proper divisors (4283099640).

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

1806918840 is a wasteful number, since it uses less digits than its factorization.

1806918840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185923 (or 185907 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 45.

The square root of 1806918840 is about 42507.8679775874. The cubic root of 1806918840 is about 1217.9969909411.

The spelling of 1806918840 in words is "one billion, eight hundred six million, nine hundred eighteen thousand, eight hundred forty".