1218922872 has 16 divisors (see below), whose sum is σ = 3047307240. Its totient is φ = 406307616.

The previous prime is 1218922871. The next prime is 1218922877. The reversal of 1218922872 is 2782298121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1218922871) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25394203 + ... + 25394250.

Almost surely, 2^1218922872 is an apocalyptic number.

1218922872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1218922872 is an abundant number, since it is smaller than the sum of its proper divisors (1828384368).

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

1218922872 is a wasteful number, since it uses less digits than its factorization.

1218922872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50788462 (or 50788458 counting only the distinct ones).

The product of its digits is 64512, while the sum is 42.

The square root of 1218922872 is about 34913.0759458401. The cubic root of 1218922872 is about 1068.2151721771.

The spelling of 1218922872 in words is "one billion, two hundred eighteen million, nine hundred twenty-two thousand, eight hundred seventy-two".