1820822187 has 16 divisors (see below), whose sum is σ = 2470481280. Its totient is φ = 1192548672.

The previous prime is 1820822153. The next prime is 1820822197. The reversal of 1820822187 is 7812280281.

It is not a de Polignac number, because 1820822187 - 2¹⁸ = 1820560043 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1820822197) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 464088 + ... + 467994.

It is an arithmetic number, because the mean of its divisors is an integer number (154405080).

Almost surely, 2^1820822187 is an apocalyptic number.

1820822187 is a deficient number, since it is larger than the sum of its proper divisors (649659093).

1820822187 is a wasteful number, since it uses less digits than its factorization.

1820822187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6602.

The product of its (nonzero) digits is 28672, while the sum is 39.

The square root of 1820822187 is about 42671.0931076297. The cubic root of 1820822187 is about 1221.1129740970.

The spelling of 1820822187 in words is "one billion, eight hundred twenty million, eight hundred twenty-two thousand, one hundred eighty-seven".