2187806436 has 30 divisors (see below), whose sum is σ = 5719359030. Its totient is φ = 729268704.

The previous prime is 2187806407. The next prime is 2187806459. The reversal of 2187806436 is 6346087812.

It can be written as a sum of positive squares in only one way, i.e., 2078812836 + 108993600 = 45594^2 + 10440^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2187806391 and 2187806400.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 3375921 + ... + 3376568.

It is an arithmetic number, because the mean of its divisors is an integer number (190645301).

Almost surely, 2^2187806436 is an apocalyptic number.

It is an amenable number.

2187806436 is an abundant number, since it is smaller than the sum of its proper divisors (3531552594).

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

2187806436 is a wasteful number, since it uses less digits than its factorization.

2187806436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6752505 (or 6752494 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 45.

The square root of 2187806436 is about 46773.9931585919. The cubic root of 2187806436 is about 1298.1841385229.

The spelling of 2187806436 in words is "two billion, one hundred eighty-seven million, eight hundred six thousand, four hundred thirty-six".