212378838 has 24 divisors (see below), whose sum is σ = 494106552. Its totient is φ = 60679584.

The previous prime is 212378833. The next prime is 212378851. The reversal of 212378838 is 838873212.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 212378838.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212378833) 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 11 ways as a sum of consecutive naturals, for example, 360895 + ... + 361482.

It is an arithmetic number, because the mean of its divisors is an integer number (20587773).

Almost surely, 2^212378838 is an apocalyptic number.

212378838 is an abundant number, since it is smaller than the sum of its proper divisors (281727714).

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

212378838 is a wasteful number, since it uses less digits than its factorization.

212378838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 722396 (or 722389 counting only the distinct ones).

The product of its digits is 129024, while the sum is 42.

The square root of 212378838 is about 14573.2233222441. The cubic root of 212378838 is about 596.6281588637.

The spelling of 212378838 in words is "two hundred twelve million, three hundred seventy-eight thousand, eight hundred thirty-eight".