1820257118 has 4 divisors (see below), whose sum is σ = 2730385680. Its totient is φ = 910128558.

The previous prime is 1820257111. The next prime is 1820257129. The reversal of 1820257118 is 8117520281.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1820257111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 455064278 + ... + 455064281.

It is an arithmetic number, because the mean of its divisors is an integer number (682596420).

Almost surely, 2^1820257118 is an apocalyptic number.

1820257118 is a deficient number, since it is larger than the sum of its proper divisors (910128562).

1820257118 is an equidigital number, since it uses as much as digits as its factorization.

1820257118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 910128561.

The product of its (nonzero) digits is 8960, while the sum is 35.

The square root of 1820257118 is about 42664.4713784198. The cubic root of 1820257118 is about 1220.9866420690.

Adding to 1820257118 its reverse (8117520281), we get a palindrome (9937777399).

The spelling of 1820257118 in words is "one billion, eight hundred twenty million, two hundred fifty-seven thousand, one hundred eighteen".