1209928 has 8 divisors (see below), whose sum is σ = 2268630. Its totient is φ = 604960.

The previous prime is 1209889. The next prime is 1209931. The reversal of 1209928 is 8299021.

It can be written as a sum of positive squares in only one way, i.e., 1170724 + 39204 = 1082^2 + 198^2 .

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

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 1209928.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 75613 + ... + 75628.

2^1209928 is an apocalyptic number.

It is an amenable number.

1209928 is a deficient number, since it is larger than the sum of its proper divisors (1058702).

1209928 is a wasteful number, since it uses less digits than its factorization.

1209928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151247 (or 151243 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 1209928 is about 1099.9672722404. The cubic root of 1209928 is about 106.5581100435.

The spelling of 1209928 in words is "one million, two hundred nine thousand, nine hundred twenty-eight".