218720426 has 8 divisors (see below), whose sum is σ = 328148544. Its totient is φ = 109337580.

The previous prime is 218720423. The next prime is 218720429. The reversal of 218720426 is 624027812.

It is an interprime number because it is at equal distance from previous prime (218720423) and next prime (218720429).

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 = 218720392 and 218720401.

It is not an unprimeable number, because it can be changed into a prime (218720423) 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, 6161 + ... + 21803.

It is an arithmetic number, because the mean of its divisors is an integer number (41018568).

Almost surely, 2^218720426 is an apocalyptic number.

218720426 is a deficient number, since it is larger than the sum of its proper divisors (109428118).

218720426 is a wasteful number, since it uses less digits than its factorization.

218720426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22636.

The product of its (nonzero) digits is 10752, while the sum is 32.

The square root of 218720426 is about 14789.1996402780. The cubic root of 218720426 is about 602.5084114687.

The spelling of 218720426 in words is "two hundred eighteen million, seven hundred twenty thousand, four hundred twenty-six".