218423428 has 12 divisors (see below), whose sum is σ = 388720080. Its totient is φ = 107360552.

The previous prime is 218423419. The next prime is 218423437. The reversal of 218423428 is 824324812.

It is an interprime number because it is at equal distance from previous prime (218423419) and next prime (218423437).

It is a junction number, because it is equal to n+sod(n) for n = 218423393 and 218423402.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 462526 + ... + 462997.

It is an arithmetic number, because the mean of its divisors is an integer number (32393340).

Almost surely, 2^218423428 is an apocalyptic number.

It is an amenable number.

218423428 is a deficient number, since it is larger than the sum of its proper divisors (170296652).

218423428 is a wasteful number, since it uses less digits than its factorization.

218423428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 925586 (or 925584 counting only the distinct ones).

The product of its digits is 24576, while the sum is 34.

The square root of 218423428 is about 14779.1551855984. The cubic root of 218423428 is about 602.2355748116.

The spelling of 218423428 in words is "two hundred eighteen million, four hundred twenty-three thousand, four hundred twenty-eight".