1812377873 has 4 divisors (see below), whose sum is σ = 1813273140. Its totient is φ = 1811482608.

The previous prime is 1812377867. The next prime is 1812377923. The reversal of 1812377873 is 3787732181.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1537580944 + 274796929 = 39212^2 + 16577^2 .

It is a cyclic number.

It is not a de Polignac number, because 1812377873 - 2⁸ = 1812377617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1812377813) 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, 444590 + ... + 448647.

It is an arithmetic number, because the mean of its divisors is an integer number (453318285).

Almost surely, 2^1812377873 is an apocalyptic number.

It is an amenable number.

1812377873 is a deficient number, since it is larger than the sum of its proper divisors (895267).

1812377873 is an equidigital number, since it uses as much as digits as its factorization.

1812377873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 895266.

The product of its digits is 395136, while the sum is 47.

The square root of 1812377873 is about 42572.0315817791. The cubic root of 1812377873 is about 1219.2223551359. Note that the first 3 decimals are identical.

The spelling of 1812377873 in words is "one billion, eight hundred twelve million, three hundred seventy-seven thousand, eight hundred seventy-three".