1218588280 has 64 divisors (see below), whose sum is σ = 3374562240. Its totient is φ = 385661952.

The previous prime is 1218588263. The next prime is 1218588307. The reversal of 1218588280 is 828858121.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 163749 + ... + 171028.

It is an arithmetic number, because the mean of its divisors is an integer number (52727535).

Almost surely, 2^1218588280 is an apocalyptic number.

1218588280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1218588280 is an abundant number, since it is smaller than the sum of its proper divisors (2155973960).

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

1218588280 is a wasteful number, since it uses less digits than its factorization.

1218588280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334808 (or 334804 counting only the distinct ones).

The product of its (nonzero) digits is 81920, while the sum is 43.

The square root of 1218588280 is about 34908.2838306325. The cubic root of 1218588280 is about 1068.1174222244.

The spelling of 1218588280 in words is "one billion, two hundred eighteen million, five hundred eighty-eight thousand, two hundred eighty".