1218438442 has 8 divisors (see below), whose sum is σ = 1968246756. Its totient is φ = 562356192.

The previous prime is 1218438421. The next prime is 1218438623. The reversal of 1218438442 is 2448348121.

It can be written as a sum of positive squares in 2 ways, for example, as 883218961 + 335219481 = 29719^2 + 18309^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23431483 + ... + 23431534.

Almost surely, 2^1218438442 is an apocalyptic number.

1218438442 is a deficient number, since it is larger than the sum of its proper divisors (749808314).

1218438442 is a wasteful number, since it uses less digits than its factorization.

1218438442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46863032.

The product of its digits is 49152, while the sum is 37.

The square root of 1218438442 is about 34906.1375978495. The cubic root of 1218438442 is about 1068.0736417446.

The spelling of 1218438442 in words is "one billion, two hundred eighteen million, four hundred thirty-eight thousand, four hundred forty-two".