1200128270 has 32 divisors (see below), whose sum is σ = 2459082240. Its totient is φ = 417435040.

The previous prime is 1200128227. The next prime is 1200128309. The reversal of 1200128270 is 728210021.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 234650 + ... + 239709.

It is an arithmetic number, because the mean of its divisors is an integer number (76846320).

Almost surely, 2^1200128270 is an apocalyptic number.

1200128270 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1200128270 is an abundant number, since it is smaller than the sum of its proper divisors (1258953970).

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

1200128270 is a wasteful number, since it uses less digits than its factorization.

1200128270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 474400.

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 1200128270 is about 34642.8675198806. The cubic root of 1200128270 is about 1062.6964309488.

Adding to 1200128270 its reverse (728210021), we get a palindrome (1928338291).

The spelling of 1200128270 in words is "one billion, two hundred million, one hundred twenty-eight thousand, two hundred seventy".