218220839 has 2 divisors, whose sum is σ = 218220840. Its totient is φ = 218220838.

The previous prime is 218220817. The next prime is 218220883. The reversal of 218220839 is 938022812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 218220839 - 2²⁴ = 201443623 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 218220799 and 218220808.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (218220889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109110419 + 109110420.

It is an arithmetic number, because the mean of its divisors is an integer number (109110420).

Almost surely, 2^218220839 is an apocalyptic number.

218220839 is a deficient number, since it is larger than the sum of its proper divisors (1).

218220839 is an equidigital number, since it uses as much as digits as its factorization.

218220839 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 218220839 is about 14772.2997194073. The cubic root of 218220839 is about 602.0493248842.

The spelling of 218220839 in words is "two hundred eighteen million, two hundred twenty thousand, eight hundred thirty-nine".