1820438475 has 48 divisors (see below), whose sum is σ = 3075993600. Its totient is φ = 949777920.

The previous prime is 1820438471. The next prime is 1820438483. The reversal of 1820438475 is 5748340281.

It is not a de Polignac number, because 1820438475 - 2² = 1820438471 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1820438471) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 668166 + ... + 670884.

It is an arithmetic number, because the mean of its divisors is an integer number (64083200).

Almost surely, 2^1820438475 is an apocalyptic number.

1820438475 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1820438475 is a deficient number, since it is larger than the sum of its proper divisors (1255555125).

1820438475 is a wasteful number, since it uses less digits than its factorization.

1820438475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2924 (or 2919 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 42.

The square root of 1820438475 is about 42666.5967121822. The cubic root of 1820438475 is about 1221.0271907583.

The spelling of 1820438475 in words is "one billion, eight hundred twenty million, four hundred thirty-eight thousand, four hundred seventy-five".