1200109128 has 16 divisors (see below), whose sum is σ = 3000272880. Its totient is φ = 400036368.

The previous prime is 1200109093. The next prime is 1200109133. The reversal of 1200109128 is 8219010021.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 50004547 = 1200109128 / (1 + 2 + 0 + 0 + 1 + 0 + 9 + 1 + 2 + 8).

It is a junction number, because it is equal to n+sod(n) for n = 1200109098 and 1200109107.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25002250 + ... + 25002297.

It is an arithmetic number, because the mean of its divisors is an integer number (187517055).

Almost surely, 2^1200109128 is an apocalyptic number.

It is an amenable number.

1200109128 is an abundant number, since it is smaller than the sum of its proper divisors (1800163752).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1200109128 is a wasteful number, since it uses less digits than its factorization.

1200109128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50004556 (or 50004552 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 24.

The square root of 1200109128 is about 34642.5912425731. The cubic root of 1200109128 is about 1062.6907809296.

Adding to 1200109128 its reverse (8219010021), we get a palindrome (9419119149).

The spelling of 1200109128 in words is "one billion, two hundred million, one hundred nine thousand, one hundred twenty-eight".