1243002144 has 24 divisors (see below), whose sum is σ = 3262880880. Its totient is φ = 414334016.

The previous prime is 1243002143. The next prime is 1243002193. The reversal of 1243002144 is 4412003421.

It is a tau number, because it is divible by the number of its divisors (24).

It is a self number, because there is not a number n which added to its sum of digits gives 1243002144.

It is not an unprimeable number, because it can be changed into a prime (1243002143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6473874 + ... + 6474065.

It is an arithmetic number, because the mean of its divisors is an integer number (135953370).

Almost surely, 2^1243002144 is an apocalyptic number.

It is an amenable number.

1243002144 is an abundant number, since it is smaller than the sum of its proper divisors (2019878736).

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

1243002144 is a wasteful number, since it uses less digits than its factorization.

1243002144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12947952 (or 12947944 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 1243002144 is about 35256.2355335904. The cubic root of 1243002144 is about 1075.2033922707.

Adding to 1243002144 its reverse (4412003421), we get a palindrome (5655005565).

The spelling of 1243002144 in words is "one billion, two hundred forty-three million, two thousand, one hundred forty-four".