212255440 has 20 divisors (see below), whose sum is σ = 493494084. Its totient is φ = 84902144.

The previous prime is 212255429. The next prime is 212255443. The reversal of 212255440 is 44552212.

It can be written as a sum of positive squares in 2 ways, for example, as 164147344 + 48108096 = 12812^2 + 6936^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212255443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1326517 + ... + 1326676.

Almost surely, 2^212255440 is an apocalyptic number.

212255440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212255440 is an abundant number, since it is smaller than the sum of its proper divisors (281238644).

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

212255440 is a wasteful number, since it uses less digits than its factorization.

212255440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2653206 (or 2653200 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 25.

The square root of 212255440 is about 14568.9889834539. The cubic root of 212255440 is about 596.5125839696.

The spelling of 212255440 in words is "two hundred twelve million, two hundred fifty-five thousand, four hundred forty".