1218539280 has 80 divisors (see below), whose sum is σ = 4317116544. Its totient is φ = 278522880.

The previous prime is 1218539221. The next prime is 1218539281. The reversal of 1218539280 is 829358121.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (1218539281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 360981 + ... + 364340.

Almost surely, 2^1218539280 is an apocalyptic number.

1218539280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1218539280 is an abundant number, since it is smaller than the sum of its proper divisors (3098577264).

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

1218539280 is a wasteful number, since it uses less digits than its factorization.

1218539280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 725344 (or 725338 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 39.

The square root of 1218539280 is about 34907.5819844343. The cubic root of 1218539280 is about 1068.1031055335.

The spelling of 1218539280 in words is "one billion, two hundred eighteen million, five hundred thirty-nine thousand, two hundred eighty".