212840399 has 2 divisors, whose sum is σ = 212840400. Its totient is φ = 212840398.

The previous prime is 212840363. The next prime is 212840401. The reversal of 212840399 is 993048212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 212840399 - 2¹² = 212836303 is a prime.

Together with 212840401, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212840899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106420199 + 106420200.

It is an arithmetic number, because the mean of its divisors is an integer number (106420200).

Almost surely, 2^212840399 is an apocalyptic number.

212840399 is a deficient number, since it is larger than the sum of its proper divisors (1).

212840399 is an equidigital number, since it uses as much as digits as its factorization.

212840399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 212840399 is about 14589.0506545148. The cubic root of 212840399 is about 597.0600616510.

The spelling of 212840399 in words is "two hundred twelve million, eight hundred forty thousand, three hundred ninety-nine".