212404440 has 64 divisors (see below), whose sum is σ = 647681760. Its totient is φ = 55710720.

The previous prime is 212404429. The next prime is 212404447. The reversal of 212404440 is 44404212.

It is a super-2 number, since 2×212404440² = 90231292263427200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212404447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7189 + ... + 21828.

Almost surely, 2^212404440 is an apocalyptic number.

212404440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212404440 is an abundant number, since it is smaller than the sum of its proper divisors (435277320).

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

212404440 is a wasteful number, since it uses less digits than its factorization.

212404440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29092 (or 29088 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 21.

The square root of 212404440 is about 14574.1016875827. The cubic root of 212404440 is about 596.6521321567.

Adding to 212404440 its reverse (44404212), we get a palindrome (256808652).

The spelling of 212404440 in words is "two hundred twelve million, four hundred four thousand, four hundred forty".