2187218404 has 24 divisors (see below), whose sum is σ = 4395180608. Its totient is φ = 932934240.

The previous prime is 2187218401. The next prime is 2187218437. The reversal of 2187218404 is 4048127812.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (2187218401) 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, 179199 + ... + 191014.

Almost surely, 2^2187218404 is an apocalyptic number.

It is an amenable number.

2187218404 is an abundant number, since it is smaller than the sum of its proper divisors (2207962204).

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

2187218404 is a wasteful number, since it uses less digits than its factorization.

2187218404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 370435 (or 370433 counting only the distinct ones).

The product of its (nonzero) digits is 28672, while the sum is 37.

The square root of 2187218404 is about 46767.7068499194. The cubic root of 2187218404 is about 1298.0678207650.

The spelling of 2187218404 in words is "two billion, one hundred eighty-seven million, two hundred eighteen thousand, four hundred four".