1243012144 has 20 divisors (see below), whose sum is σ = 2627276040. Its totient is φ = 565005440.

The previous prime is 1243012117. The next prime is 1243012153. The reversal of 1243012144 is 4412103421.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is an unprimeable number.

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, 3531109 + ... + 3531460.

It is an arithmetic number, because the mean of its divisors is an integer number (131363802).

Almost surely, 2^1243012144 is an apocalyptic number.

It is an amenable number.

1243012144 is an abundant number, since it is smaller than the sum of its proper divisors (1384263896).

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

1243012144 is a wasteful number, since it uses less digits than its factorization.

1243012144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7062588 (or 7062582 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 1243012144 is about 35256.3773521898. The cubic root of 1243012144 is about 1075.2062756138.

Adding to 1243012144 its reverse (4412103421), we get a palindrome (5655115565).

The spelling of 1243012144 in words is "one billion, two hundred forty-three million, twelve thousand, one hundred forty-four".