1218648188 has 6 divisors (see below), whose sum is σ = 2132634336. Its totient is φ = 609324092.

The previous prime is 1218648181. The next prime is 1218648191. The reversal of 1218648188 is 8818468121.

It is a super-2 number, since 2×1218648188² = 2970206812231366688, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1218648181) by changing a digit.

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 as a sum of consecutive naturals, namely, 152331020 + ... + 152331027.

It is an arithmetic number, because the mean of its divisors is an integer number (355439056).

Almost surely, 2^1218648188 is an apocalyptic number.

It is an amenable number.

1218648188 is a deficient number, since it is larger than the sum of its proper divisors (913986148).

1218648188 is a wasteful number, since it uses less digits than its factorization.

1218648188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304662051 (or 304662049 counting only the distinct ones).

The product of its digits is 196608, while the sum is 47.

The square root of 1218648188 is about 34909.1418972166. The cubic root of 1218648188 is about 1068.1349254645.

The spelling of 1218648188 in words is "one billion, two hundred eighteen million, six hundred forty-eight thousand, one hundred eighty-eight".