1218921480 has 128 divisors (see below), whose sum is σ = 4643539200. Its totient is φ = 278608896.

The previous prime is 1218921449. The next prime is 1218921481. The reversal of 1218921480 is 841298121.

It is a happy number.

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 (1218921481) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 73057 + ... + 88176.

It is an arithmetic number, because the mean of its divisors is an integer number (36277650).

Almost surely, 2^1218921480 is an apocalyptic number.

1218921480 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1218921480 is an abundant number, since it is smaller than the sum of its proper divisors (3424617720).

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

1218921480 is a wasteful number, since it uses less digits than its factorization.

1218921480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161260 (or 161250 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 36.

The square root of 1218921480 is about 34913.0560106101. The cubic root of 1218921480 is about 1068.2147655459.

The spelling of 1218921480 in words is "one billion, two hundred eighteen million, nine hundred twenty-one thousand, four hundred eighty".