212378138 has 8 divisors (see below), whose sum is σ = 364076832. Its totient is φ = 91019196.

The previous prime is 212378137. The next prime is 212378147. The reversal of 212378138 is 831873212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 212378098 and 212378107.

It is not an unprimeable number, because it can be changed into a prime (212378137) 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 3 ways as a sum of consecutive naturals, for example, 7584920 + ... + 7584947.

It is an arithmetic number, because the mean of its divisors is an integer number (45509604).

Almost surely, 2^212378138 is an apocalyptic number.

212378138 is a deficient number, since it is larger than the sum of its proper divisors (151698694).

212378138 is a wasteful number, since it uses less digits than its factorization.

212378138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15169876.

The product of its digits is 16128, while the sum is 35.

The square root of 212378138 is about 14573.1993055746. The cubic root of 212378138 is about 596.6275033681.

The spelling of 212378138 in words is "two hundred twelve million, three hundred seventy-eight thousand, one hundred thirty-eight".