211997492 has 24 divisors (see below), whose sum is σ = 427753536. Its totient is φ = 90050688.

The previous prime is 211997491. The next prime is 211997503. The reversal of 211997492 is 294799112.

It is a super-3 number, since 3×211997492³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211997491) 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, 30338 + ... + 36665.

It is an arithmetic number, because the mean of its divisors is an integer number (17823064).

Almost surely, 2^211997492 is an apocalyptic number.

It is an amenable number.

211997492 is an abundant number, since it is smaller than the sum of its proper divisors (215756044).

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

211997492 is a wasteful number, since it uses less digits than its factorization.

211997492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67127 (or 67125 counting only the distinct ones).

The product of its digits is 81648, while the sum is 44.

The square root of 211997492 is about 14560.1336532327. The cubic root of 211997492 is about 596.2708444236.

The spelling of 211997492 in words is "two hundred eleven million, nine hundred ninety-seven thousand, four hundred ninety-two".