1809872 has 10 divisors (see below), whose sum is σ = 3506658. Its totient is φ = 904928.

The previous prime is 1809859. The next prime is 1809881. The reversal of 1809872 is 2789081.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1430416 + 379456 = 1196^2 + 616^2 .

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, 56543 + ... + 56574.

2^1809872 is an apocalyptic number.

It is an amenable number.

1809872 is a deficient number, since it is larger than the sum of its proper divisors (1696786).

1809872 is a wasteful number, since it uses less digits than its factorization.

1809872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113125 (or 113119 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 35.

The square root of 1809872 is about 1345.3148330410. The cubic root of 1809872 is about 121.8660179223.

The spelling of 1809872 in words is "one million, eight hundred nine thousand, eight hundred seventy-two".