1218908520 has 256 divisors, whose sum is σ = 4313088000. Its totient is φ = 305337600.

The previous prime is 1218908519. The next prime is 1218908543. The reversal of 1218908520 is 258098121.

1218908520 is a `hidden beast` number, since 121 + 8 + 9 + 0 + 8 + 520 = 666.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3919165 + ... + 3919475.

It is an arithmetic number, because the mean of its divisors is an integer number (16848000).

Almost surely, 2^1218908520 is an apocalyptic number.

1218908520 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 1218908520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2156544000).

1218908520 is an abundant number, since it is smaller than the sum of its proper divisors (3094179480).

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

1218908520 is a wasteful number, since it uses less digits than its factorization.

1218908520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 541 (or 531 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 36.

The square root of 1218908520 is about 34912.8704061983. The cubic root of 1218908520 is about 1068.2109796547.

The spelling of 1218908520 in words is "one billion, two hundred eighteen million, nine hundred eight thousand, five hundred twenty".