211085730 has 32 divisors (see below), whose sum is σ = 562896000. Its totient is φ = 56289456.

The previous prime is 211085717. The next prime is 211085731. The reversal of 211085730 is 37580112.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 211085694 and 211085703.

It is not an unprimeable number, because it can be changed into a prime (211085731) 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 15 ways as a sum of consecutive naturals, for example, 390630 + ... + 391169.

It is an arithmetic number, because the mean of its divisors is an integer number (17590500).

Almost surely, 2^211085730 is an apocalyptic number.

211085730 is an abundant number, since it is smaller than the sum of its proper divisors (351810270).

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

211085730 is a wasteful number, since it uses less digits than its factorization.

211085730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 781815 (or 781809 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 211085730 is about 14528.7896949471. The cubic root of 211085730 is about 595.4147991474.

The spelling of 211085730 in words is "two hundred eleven million, eighty-five thousand, seven hundred thirty".