212147440 has 40 divisors (see below), whose sum is σ = 493874640. Its totient is φ = 84750336.

The previous prime is 212147401. The next prime is 212147449. The reversal of 212147440 is 44741212.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212147449) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 96271 + ... + 98449.

It is an arithmetic number, because the mean of its divisors is an integer number (12346866).

Almost surely, 2^212147440 is an apocalyptic number.

212147440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212147440 is an abundant number, since it is smaller than the sum of its proper divisors (281727200).

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

212147440 is a wasteful number, since it uses less digits than its factorization.

212147440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3409 (or 3403 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 25.

The square root of 212147440 is about 14565.2820089417. The cubic root of 212147440 is about 596.4113941190.

Adding to 212147440 its reverse (44741212), we get a palindrome (256888652).

The spelling of 212147440 in words is "two hundred twelve million, one hundred forty-seven thousand, four hundred forty".