2187709434 has 48 divisors (see below), whose sum is σ = 4903884648. Its totient is φ = 704318976.

The previous prime is 2187709411. The next prime is 2187709487. The reversal of 2187709434 is 4349077812.

It can be written as a sum of positive squares in 4 ways, for example, as 2135826225 + 51883209 = 46215^2 + 7203^2 .

It is a super-2 number, since 2×2187709434² = 9572145135225200712, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2187709434.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 79254 + ... + 103230.

Almost surely, 2^2187709434 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2187709434, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2451942324).

2187709434 is an abundant number, since it is smaller than the sum of its proper divisors (2716175214).

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

2187709434 is a wasteful number, since it uses less digits than its factorization.

2187709434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24159 (or 24156 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 45.

The square root of 2187709434 is about 46772.9562247246. The cubic root of 2187709434 is about 1298.1649521335.

The spelling of 2187709434 in words is "two billion, one hundred eighty-seven million, seven hundred nine thousand, four hundred thirty-four".