218977423 has 6 divisors (see below), whose sum is σ = 254728896. Its totient is φ = 187694892.

The previous prime is 218977417. The next prime is 218977441. The reversal of 218977423 is 324779812.

218977423 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 218977423 - 2⁹ = 218976911 is a prime.

It is a super-2 number, since 2×218977423² = 95902223567441858, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 218977423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218975423) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2234415 + ... + 2234512.

It is an arithmetic number, because the mean of its divisors is an integer number (42454816).

Almost surely, 2^218977423 is an apocalyptic number.

218977423 is a deficient number, since it is larger than the sum of its proper divisors (35751473).

218977423 is an equidigital number, since it uses as much as digits as its factorization.

218977423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4468941 (or 4468934 counting only the distinct ones).

The product of its digits is 169344, while the sum is 43.

The square root of 218977423 is about 14797.8857611484. The cubic root of 218977423 is about 602.7443020219.

The spelling of 218977423 in words is "two hundred eighteen million, nine hundred seventy-seven thousand, four hundred twenty-three".