1218995280 has 240 divisors, whose sum is σ = 4294368000. Its totient is φ = 309464064.

The previous prime is 1218995279. The next prime is 1218995317. The reversal of 1218995280 is 825998121.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1649151 + ... + 1649889.

It is an arithmetic number, because the mean of its divisors is an integer number (17893200).

Almost surely, 2^1218995280 is an apocalyptic number.

1218995280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1218995280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2147184000).

1218995280 is an abundant number, since it is smaller than the sum of its proper divisors (3075372720).

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

1218995280 is a wasteful number, since it uses less digits than its factorization.

1218995280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 866 (or 857 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 45.

The square root of 1218995280 is about 34914.1129058150. The cubic root of 1218995280 is about 1068.2363235817.

The spelling of 1218995280 in words is "one billion, two hundred eighteen million, nine hundred ninety-five thousand, two hundred eighty".