1209872 has 10 divisors (see below), whose sum is σ = 2344158. Its totient is φ = 604928.

The previous prime is 1209853. The next prime is 1209877. The reversal of 1209872 is 2789021.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 913936 + 295936 = 956^2 + 544^2 .

It is not an unprimeable number, because it can be changed into a prime (1209877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37793 + ... + 37824.

2^1209872 is an apocalyptic number.

It is an amenable number.

1209872 is a deficient number, since it is larger than the sum of its proper divisors (1134286).

1209872 is an equidigital number, since it uses as much as digits as its factorization.

1209872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75625 (or 75619 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 1209872 is about 1099.9418166430. The cubic root of 1209872 is about 106.5564660487.

The spelling of 1209872 in words is "one million, two hundred nine thousand, eight hundred seventy-two".