1244402128 has 10 divisors (see below), whose sum is σ = 2411029154. Its totient is φ = 622201056.

The previous prime is 1244402101. The next prime is 1244402129. The reversal of 1244402128 is 8212044421.

It can be written as a sum of positive squares in only one way, i.e., 1222761024 + 21641104 = 34968^2 + 4652^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1244402096 and 1244402105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1244402129) by changing a digit.

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 as a sum of consecutive naturals, namely, 38887551 + ... + 38887582.

Almost surely, 2^1244402128 is an apocalyptic number.

It is an amenable number.

1244402128 is a deficient number, since it is larger than the sum of its proper divisors (1166627026).

1244402128 is an equidigital number, since it uses as much as digits as its factorization.

1244402128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77775141 (or 77775135 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 28.

The square root of 1244402128 is about 35276.0843632056. The cubic root of 1244402128 is about 1075.6069053251.

Adding to 1244402128 its reverse (8212044421), we get a palindrome (9456446549).

The spelling of 1244402128 in words is "one billion, two hundred forty-four million, four hundred two thousand, one hundred twenty-eight".