1244402147 has 4 divisors (see below), whose sum is σ = 1252036680. Its totient is φ = 1236767616.

The previous prime is 1244402141. The next prime is 1244402171. The reversal of 1244402147 is 7412044421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7412044421 = 17 ⋅436002613.

It is a cyclic number.

It is not a de Polignac number, because 1244402147 - 2¹⁸ = 1244140003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1244402141) 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 in 3 ways as a sum of consecutive naturals, for example, 3817022 + ... + 3817347.

It is an arithmetic number, because the mean of its divisors is an integer number (313009170).

Almost surely, 2^1244402147 is an apocalyptic number.

1244402147 is a deficient number, since it is larger than the sum of its proper divisors (7634533).

1244402147 is an equidigital number, since it uses as much as digits as its factorization.

1244402147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7634532.

The product of its (nonzero) digits is 7168, while the sum is 29.

The square root of 1244402147 is about 35276.0846325099. The cubic root of 1244402147 is about 1075.6069107994.

Adding to 1244402147 its reverse (7412044421), we get a palindrome (8656446568).

The spelling of 1244402147 in words is "one billion, two hundred forty-four million, four hundred two thousand, one hundred forty-seven".