1820125418 has 4 divisors (see below), whose sum is σ = 2730188130. Its totient is φ = 910062708.

The previous prime is 1820125409. The next prime is 1820125421. The reversal of 1820125418 is 8145210281.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8145210281 = 13 ⋅626554637.

It can be written as a sum of positive squares in only one way, i.e., 1610657689 + 209467729 = 40133^2 + 14473^2 .

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, 455031353 + ... + 455031356.

Almost surely, 2^1820125418 is an apocalyptic number.

1820125418 is a deficient number, since it is larger than the sum of its proper divisors (910062712).

1820125418 is an equidigital number, since it uses as much as digits as its factorization.

1820125418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 910062711.

The product of its (nonzero) digits is 5120, while the sum is 32.

The square root of 1820125418 is about 42662.9279117128. The cubic root of 1820125418 is about 1220.9571942477.

Adding to 1820125418 its reverse (8145210281), we get a palindrome (9965335699).

The spelling of 1820125418 in words is "one billion, eight hundred twenty million, one hundred twenty-five thousand, four hundred eighteen".