1218143924 has 6 divisors (see below), whose sum is σ = 2131751874. Its totient is φ = 609071960.

The previous prime is 1218143921. The next prime is 1218143957. The reversal of 1218143924 is 4293418121.

It can be written as a sum of positive squares in only one way, i.e., 957902500 + 260241424 = 30950^2 + 16132^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1218143921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152267987 + ... + 152267994.

It is an arithmetic number, because the mean of its divisors is an integer number (355291979).

Almost surely, 2^1218143924 is an apocalyptic number.

It is an amenable number.

1218143924 is a deficient number, since it is larger than the sum of its proper divisors (913607950).

1218143924 is a wasteful number, since it uses less digits than its factorization.

1218143924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304535985 (or 304535983 counting only the distinct ones).

The product of its digits is 13824, while the sum is 35.

The square root of 1218143924 is about 34901.9186292101. The cubic root of 1218143924 is about 1067.9875774154.

The spelling of 1218143924 in words is "one billion, two hundred eighteen million, one hundred forty-three thousand, nine hundred twenty-four".