212691744 has 120 divisors (see below), whose sum is σ = 645942528. Its totient is φ = 68584320.

The previous prime is 212691673. The next prime is 212691751. The reversal of 212691744 is 447196212.

It is a happy number.

212691744 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 212691699 and 212691708.

It is an unprimeable number.

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 19 ways as a sum of consecutive naturals, for example, 79029 + ... + 81675.

Almost surely, 2^212691744 is an apocalyptic number.

212691744 is a gapful number since it is divisible by the number (24) 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 212691744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (322971264).

212691744 is an abundant number, since it is smaller than the sum of its proper divisors (433250784).

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

212691744 is a wasteful number, since it uses less digits than its factorization.

212691744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2700 (or 2683 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 212691744 is about 14583.9550191298. The cubic root of 212691744 is about 596.9210269012.

The spelling of 212691744 in words is "two hundred twelve million, six hundred ninety-one thousand, seven hundred forty-four".