1820537018 has 4 divisors (see below), whose sum is σ = 2730805530. Its totient is φ = 910268508.

The previous prime is 1820536961. The next prime is 1820537077. The reversal of 1820537018 is 8107350281.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8107350281 = 25601 ⋅316681.

It can be written as a sum of positive squares in only one way, i.e., 1401229489 + 419307529 = 37433^2 + 20477^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 455134253 + ... + 455134256.

Almost surely, 2^1820537018 is an apocalyptic number.

1820537018 is a deficient number, since it is larger than the sum of its proper divisors (910268512).

1820537018 is an equidigital number, since it uses as much as digits as its factorization.

1820537018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 910268511.

The product of its (nonzero) digits is 13440, while the sum is 35.

The square root of 1820537018 is about 42667.7514992295. The cubic root of 1820537018 is about 1221.0492223573.

Adding to 1820537018 its reverse (8107350281), we get a palindrome (9927887299).

The spelling of 1820537018 in words is "one billion, eight hundred twenty million, five hundred thirty-seven thousand, eighteen".