213820839 has 12 divisors (see below), whose sum is σ = 309016656. Its totient is φ = 142471392.

The previous prime is 213820829. The next prime is 213820843. The reversal of 213820839 is 938028312.

It is a happy number.

It is not a de Polignac number, because 213820839 - 2⁴ = 213820823 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213820829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15502 + ... + 25844.

It is an arithmetic number, because the mean of its divisors is an integer number (25751388).

Almost surely, 2^213820839 is an apocalyptic number.

213820839 is a deficient number, since it is larger than the sum of its proper divisors (95195817).

213820839 is a wasteful number, since it uses less digits than its factorization.

213820839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12646 (or 12643 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 213820839 is about 14622.6139592072. The cubic root of 213820839 is about 597.9754345751.

The spelling of 213820839 in words is "two hundred thirteen million, eight hundred twenty thousand, eight hundred thirty-nine".