212412440 has 16 divisors (see below), whose sum is σ = 477928080. Its totient is φ = 84964960.

The previous prime is 212412413. The next prime is 212412451. The reversal of 212412440 is 44214212.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2655116 + ... + 2655195.

It is an arithmetic number, because the mean of its divisors is an integer number (29870505).

Almost surely, 2^212412440 is an apocalyptic number.

212412440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212412440 is an abundant number, since it is smaller than the sum of its proper divisors (265515640).

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

212412440 is a wasteful number, since it uses less digits than its factorization.

212412440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5310322 (or 5310318 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 212412440 is about 14574.3761444530. The cubic root of 212412440 is about 596.6596228305.

Adding to 212412440 its reverse (44214212), we get a palindrome (256626652).

The spelling of 212412440 in words is "two hundred twelve million, four hundred twelve thousand, four hundred forty".