1218477180 has 24 divisors (see below), whose sum is σ = 3411736272. Its totient is φ = 324927232.

The previous prime is 1218477179. The next prime is 1218477181. The reversal of 1218477180 is 817748121.

It is an interprime number because it is at equal distance from previous prime (1218477179) and next prime (1218477181).

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1218477181) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10153917 + ... + 10154036.

It is an arithmetic number, because the mean of its divisors is an integer number (142155678).

Almost surely, 2^1218477180 is an apocalyptic number.

1218477180 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1218477180 is an abundant number, since it is smaller than the sum of its proper divisors (2193259092).

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

1218477180 is a wasteful number, since it uses less digits than its factorization.

1218477180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20307965 (or 20307963 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 39.

The square root of 1218477180 is about 34906.6924815285. The cubic root of 1218477180 is about 1068.0849607676.

The spelling of 1218477180 in words is "one billion, two hundred eighteen million, four hundred seventy-seven thousand, one hundred eighty".