212878447 has 2 divisors, whose sum is σ = 212878448. Its totient is φ = 212878446.

The previous prime is 212878429. The next prime is 212878453. The reversal of 212878447 is 744878212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 212878447 - 2¹⁵ = 212845679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212878487) 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 as a sum of consecutive naturals, namely, 106439223 + 106439224.

It is an arithmetic number, because the mean of its divisors is an integer number (106439224).

Almost surely, 2^212878447 is an apocalyptic number.

212878447 is a deficient number, since it is larger than the sum of its proper divisors (1).

212878447 is an equidigital number, since it uses as much as digits as its factorization.

212878447 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 200704, while the sum is 43.

The square root of 212878447 is about 14590.3545878776. The cubic root of 212878447 is about 597.0956369582.

The spelling of 212878447 in words is "two hundred twelve million, eight hundred seventy-eight thousand, four hundred forty-seven".