211587940 has 12 divisors (see below), whose sum is σ = 444334716. Its totient is φ = 84635168.

The previous prime is 211587931. The next prime is 211587947. The reversal of 211587940 is 49785112.

It can be written as a sum of positive squares in 2 ways, for example, as 97140736 + 114447204 = 9856^2 + 10698^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 211587940.

It is not an unprimeable number, because it can be changed into a prime (211587947) 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 3 ways as a sum of consecutive naturals, for example, 5289679 + ... + 5289718.

It is an arithmetic number, because the mean of its divisors is an integer number (37027893).

Almost surely, 2^211587940 is an apocalyptic number.

211587940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211587940 is an abundant number, since it is smaller than the sum of its proper divisors (232746776).

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

211587940 is a wasteful number, since it uses less digits than its factorization.

211587940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10579406 (or 10579404 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 37.

The square root of 211587940 is about 14546.0626975137. The cubic root of 211587940 is about 595.8866239305.

The spelling of 211587940 in words is "two hundred eleven million, five hundred eighty-seven thousand, nine hundred forty".