218423434 has 8 divisors (see below), whose sum is σ = 327701088. Its totient is φ = 109189740.

The previous prime is 218423419. The next prime is 218423437. The reversal of 218423434 is 434324812.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 218423396 and 218423405.

It is not an unprimeable number, because it can be changed into a prime (218423437) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7989 + ... + 22375.

It is an arithmetic number, because the mean of its divisors is an integer number (40962636).

Almost surely, 2^218423434 is an apocalyptic number.

218423434 is a deficient number, since it is larger than the sum of its proper divisors (109277654).

218423434 is a wasteful number, since it uses less digits than its factorization.

218423434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21980.

The product of its digits is 18432, while the sum is 31.

The square root of 218423434 is about 14779.1553885870. The cubic root of 218423434 is about 602.2355803260.

The spelling of 218423434 in words is "two hundred eighteen million, four hundred twenty-three thousand, four hundred thirty-four".