2187639340 has 24 divisors (see below), whose sum is σ = 4669357392. Its totient is φ = 860710080.

The previous prime is 2187639317. The next prime is 2187639343. The reversal of 2187639340 is 439367812.

It is not an unprimeable number, because it can be changed into a prime (2187639343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 895354 + ... + 897793.

It is an arithmetic number, because the mean of its divisors is an integer number (194556558).

Almost surely, 2^2187639340 is an apocalyptic number.

2187639340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2187639340 is an abundant number, since it is smaller than the sum of its proper divisors (2481718052).

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

2187639340 is a wasteful number, since it uses less digits than its factorization.

2187639340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1793217 (or 1793215 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 43.

The square root of 2187639340 is about 46772.2069182116. The cubic root of 2187639340 is about 1298.1510876253.

It can be divided in two parts, 21876 and 39340, that added together give a palindrome (61216).

The spelling of 2187639340 in words is "two billion, one hundred eighty-seven million, six hundred thirty-nine thousand, three hundred forty".