212539860 has 144 divisors (see below), whose sum is σ = 706152720. Its totient is φ = 51425280.

The previous prime is 212539807. The next prime is 212539861. The reversal of 212539860 is 68935212.

212539860 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 92505924 + 120033936 = 9618^2 + 10956^2 .

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212539861) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 141996 + ... + 143484.

Almost surely, 2^212539860 is an apocalyptic number.

212539860 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 212539860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (353076360).

212539860 is an abundant number, since it is smaller than the sum of its proper divisors (493612860).

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

212539860 is a wasteful number, since it uses less digits than its factorization.

212539860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1578 (or 1573 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 212539860 is about 14578.7468597270. The cubic root of 212539860 is about 596.7789051918.

It can be divided in two parts, 21253 and 9860, that added together give a palindrome (31113).

The spelling of 212539860 in words is "two hundred twelve million, five hundred thirty-nine thousand, eight hundred sixty".