217880423 has 2 divisors, whose sum is σ = 217880424. Its totient is φ = 217880422.

The previous prime is 217880417. The next prime is 217880459. The reversal of 217880423 is 324088712.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 217880423 - 2⁴ = 217880407 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (217880023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108940211 + 108940212.

It is an arithmetic number, because the mean of its divisors is an integer number (108940212).

Almost surely, 2^217880423 is an apocalyptic number.

217880423 is a deficient number, since it is larger than the sum of its proper divisors (1).

217880423 is an equidigital number, since it uses as much as digits as its factorization.

217880423 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21504, while the sum is 35.

The square root of 217880423 is about 14760.7731166088. The cubic root of 217880423 is about 601.7361041330.

The spelling of 217880423 in words is "two hundred seventeen million, eight hundred eighty thousand, four hundred twenty-three".