212396640 has 96 divisors (see below), whose sum is σ = 708432480. Its totient is φ = 53305344.

The previous prime is 212396629. The next prime is 212396641. The reversal of 212396640 is 46693212.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×212396640² = 90224665366579200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212396641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4855 + ... + 21174.

It is an arithmetic number, because the mean of its divisors is an integer number (7379505).

Almost surely, 2^212396640 is an apocalyptic number.

212396640 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 212396640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (354216240).

212396640 is an abundant number, since it is smaller than the sum of its proper divisors (496035840).

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

212396640 is a wasteful number, since it uses less digits than its factorization.

212396640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26064 (or 26056 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 212396640 is about 14573.8340871577. The cubic root of 212396640 is about 596.6448285687.

The spelling of 212396640 in words is "two hundred twelve million, three hundred ninety-six thousand, six hundred forty".