212969878 has 16 divisors (see below), whose sum is σ = 355912704. Its totient is φ = 94744360.

The previous prime is 212969873. The next prime is 212969893. The reversal of 212969878 is 878969212.

212969878 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212969873) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 101950 + ... + 104017.

It is an arithmetic number, because the mean of its divisors is an integer number (22244544).

Almost surely, 2^212969878 is an apocalyptic number.

212969878 is a deficient number, since it is larger than the sum of its proper divisors (142942826).

212969878 is a wasteful number, since it uses less digits than its factorization.

212969878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206027.

The product of its digits is 870912, while the sum is 52.

The square root of 212969878 is about 14593.4875201235. The cubic root of 212969878 is about 597.1811086408.

The spelling of 212969878 in words is "two hundred twelve million, nine hundred sixty-nine thousand, eight hundred seventy-eight".