1218858544 has 20 divisors (see below), whose sum is σ = 2385887224. Its totient is φ = 603145728.

The previous prime is 1218858533. The next prime is 1218858547. The reversal of 1218858544 is 4458588121.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1218858494 and 1218858503.

It is not an unprimeable number, because it can be changed into a prime (1218858547) 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, 391122 + ... + 394225.

Almost surely, 2^1218858544 is an apocalyptic number.

It is an amenable number.

1218858544 is a deficient number, since it is larger than the sum of its proper divisors (1167028680).

1218858544 is an equidigital number, since it uses as much as digits as its factorization.

1218858544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 785452 (or 785446 counting only the distinct ones).

The product of its digits is 409600, while the sum is 46.

The square root of 1218858544 is about 34912.1546742678. The cubic root of 1218858544 is about 1068.1963803524.

The spelling of 1218858544 in words is "one billion, two hundred eighteen million, eight hundred fifty-eight thousand, five hundred forty-four".