1218920124 has 24 divisors (see below), whose sum is σ = 2935894528. Its totient is φ = 393199920.

The previous prime is 1218920123. The next prime is 1218920147. The reversal of 1218920124 is 4210298121.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1218920091 and 1218920100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1218920123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1637962 + ... + 1638705.

Almost surely, 2^1218920124 is an apocalyptic number.

It is an amenable number.

1218920124 is an abundant number, since it is smaller than the sum of its proper divisors (1716974404).

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

1218920124 is a wasteful number, since it uses less digits than its factorization.

1218920124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3276705 (or 3276703 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 1218920124 is about 34913.0365909355. The cubic root of 1218920124 is about 1068.2143694307.

The spelling of 1218920124 in words is "one billion, two hundred eighteen million, nine hundred twenty thousand, one hundred twenty-four".