211385240 has 64 divisors (see below), whose sum is σ = 522041760. Its totient is φ = 76395520.

The previous prime is 211385221. The next prime is 211385261. The reversal of 211385240 is 42583112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74732 + ... + 77508.

Almost surely, 2^211385240 is an apocalyptic number.

211385240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 211385240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (261020880).

211385240 is an abundant number, since it is smaller than the sum of its proper divisors (310656520).

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

211385240 is a wasteful number, since it uses less digits than its factorization.

211385240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2972 (or 2968 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 211385240 is about 14539.0935068181. The cubic root of 211385240 is about 595.6962778423.

The spelling of 211385240 in words is "two hundred eleven million, three hundred eighty-five thousand, two hundred forty".