1820338167 has 4 divisors (see below), whose sum is σ = 2427117560. Its totient is φ = 1213558776.

The previous prime is 1820338139. The next prime is 1820338171. The reversal of 1820338167 is 7618330281.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7618330281 = 3 ⋅2539443427.

It is not a de Polignac number, because 1820338167 - 2²⁸ = 1551902711 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1820338127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 303389692 + ... + 303389697.

It is an arithmetic number, because the mean of its divisors is an integer number (606779390).

Almost surely, 2^1820338167 is an apocalyptic number.

1820338167 is a deficient number, since it is larger than the sum of its proper divisors (606779393).

1820338167 is an equidigital number, since it uses as much as digits as its factorization.

1820338167 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 606779392.

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 1820338167 is about 42665.4212096869. The cubic root of 1820338167 is about 1221.0047637356.

The spelling of 1820338167 in words is "one billion, eight hundred twenty million, three hundred thirty-eight thousand, one hundred sixty-seven".