212371840 has 64 divisors (see below), whose sum is σ = 519575760. Its totient is φ = 82962432.

The previous prime is 212371787. The next prime is 212371847. The reversal of 212371840 is 48173212.

It is a tau number, because it is divible by the number of its divisors (64).

It is a junction number, because it is equal to n+sod(n) for n = 212371799 and 212371808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212371847) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23662 + ... + 31378.

Almost surely, 2^212371840 is an apocalyptic number.

212371840 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 212371840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (259787880).

212371840 is an abundant number, since it is smaller than the sum of its proper divisors (307203920).

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

212371840 is an equidigital number, since it uses as much as digits as its factorization.

212371840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7779 (or 7767 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 212371840 is about 14572.9832223879. The cubic root of 212371840 is about 596.6216057159.

The spelling of 212371840 in words is "two hundred twelve million, three hundred seventy-one thousand, eight hundred forty".