1812872 has 8 divisors (see below), whose sum is σ = 3399150. Its totient is φ = 906432.

The previous prime is 1812871. The next prime is 1812907. The reversal of 1812872 is 2782181.

It can be written as a sum of positive squares in only one way, i.e., 1811716 + 1156 = 1346^2 + 34^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1812871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 113297 + ... + 113312.

2^1812872 is an apocalyptic number.

It is an amenable number.

1812872 is a deficient number, since it is larger than the sum of its proper divisors (1586278).

1812872 is a wasteful number, since it uses less digits than its factorization.

1812872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226615 (or 226611 counting only the distinct ones).

The product of its digits is 1792, while the sum is 29.

The square root of 1812872 is about 1346.4293520271. The cubic root of 1812872 is about 121.9333148062.

The spelling of 1812872 in words is "one million, eight hundred twelve thousand, eight hundred seventy-two".