1218503808 has 96 divisors (see below), whose sum is σ = 3558930960. Its totient is φ = 400080384.

The previous prime is 1218503807. The next prime is 1218503831. The reversal of 1218503808 is 8083058121.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×1218503808² = 2969503060221001728, which contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (1218503807) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 69291 + ... + 85077.

Almost surely, 2^1218503808 is an apocalyptic number.

1218503808 is a gapful number since it is divisible by the number (18) 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 1218503808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1779465480).

1218503808 is an abundant number, since it is smaller than the sum of its proper divisors (2340427152).

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

1218503808 is a wasteful number, since it uses less digits than its factorization.

1218503808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15874 (or 15859 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 36.

The square root of 1218503808 is about 34907.0738962749. The cubic root of 1218503808 is about 1068.0927411785.

The spelling of 1218503808 in words is "one billion, two hundred eighteen million, five hundred three thousand, eight hundred eight".