211687950 has 48 divisors (see below), whose sum is σ = 530434800. Its totient is φ = 55864320.

The previous prime is 211687939. The next prime is 211687951. The reversal of 211687950 is 59786112.

It is a junction number, because it is equal to n+sod(n) for n = 211687899 and 211687908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211687951) 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 23 ways as a sum of consecutive naturals, for example, 7276 + ... + 21824.

It is an arithmetic number, because the mean of its divisors is an integer number (11050725).

Almost surely, 2^211687950 is an apocalyptic number.

It is a pronic number, being equal to 14549×14550.

It is a practical number, because each smaller number is the sum of distinct divisors of 211687950, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (265217400).

211687950 is an abundant number, since it is smaller than the sum of its proper divisors (318746850).

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

211687950 is a wasteful number, since it uses less digits than its factorization.

211687950 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14661 (or 14656 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 39.

The square root of 211687950 is about 14549.4999914086. The cubic root of 211687950 is about 595.9804938588.

The spelling of 211687950 in words is "two hundred eleven million, six hundred eighty-seven thousand, nine hundred fifty".