1809812 has 6 divisors (see below), whose sum is σ = 3167178. Its totient is φ = 904904.

The previous prime is 1809799. The next prime is 1809823. The reversal of 1809812 is 2189081.

It can be written as a sum of positive squares in only one way, i.e., 1110916 + 698896 = 1054^2 + 836^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 226223 + ... + 226230.

It is an arithmetic number, because the mean of its divisors is an integer number (527863).

2^1809812 is an apocalyptic number.

It is an amenable number.

1809812 is a deficient number, since it is larger than the sum of its proper divisors (1357366).

1809812 is a wasteful number, since it uses less digits than its factorization.

1809812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 452457 (or 452455 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 29.

The square root of 1809812 is about 1345.2925332432. The cubic root of 1809812 is about 121.8646712264.

The spelling of 1809812 in words is "one million, eight hundred nine thousand, eight hundred twelve".