1200040144 has 10 divisors (see below), whose sum is σ = 2325077810. Its totient is φ = 600020064.

The previous prime is 1200040141. The next prime is 1200040147. The reversal of 1200040144 is 4410400021.

It is an interprime number because it is at equal distance from previous prime (1200040141) and next prime (1200040147).

It can be written as a sum of positive squares in only one way, i.e., 1184736400 + 15303744 = 34420^2 + 3912^2 .

It is a Harshad number since it is a multiple of its sum of digits (16), and also a Moran number because the ratio is a prime number: 75002509 = 1200040144 / (1 + 2 + 0 + 0 + 0 + 4 + 0 + 1 + 4 + 4).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200040141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37501239 + ... + 37501270.

It is an arithmetic number, because the mean of its divisors is an integer number (232507781).

Almost surely, 2^1200040144 is an apocalyptic number.

It is an amenable number.

1200040144 is a deficient number, since it is larger than the sum of its proper divisors (1125037666).

1200040144 is an equidigital number, since it uses as much as digits as its factorization.

1200040144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75002517 (or 75002511 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 1200040144 is about 34641.5955752618. The cubic root of 1200040144 is about 1062.6704188743.

Adding to 1200040144 its reverse (4410400021), we get a palindrome (5610440165).

The spelling of 1200040144 in words is "one billion, two hundred million, forty thousand, one hundred forty-four".