218401424 has 30 divisors (see below), whose sum is σ = 434226114. Its totient is φ = 106352640.

The previous prime is 218401361. The next prime is 218401439. The reversal of 218401424 is 424104812.

It can be written as a sum of positive squares in 3 ways, for example, as 115175824 + 103225600 = 10732^2 + 10160^2 .

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 218401393 and 218401402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 378224 + ... + 378800.

Almost surely, 2^218401424 is an apocalyptic number.

It is an amenable number.

218401424 is a deficient number, since it is larger than the sum of its proper divisors (215824690).

218401424 is an frugal number, since it uses more digits than its factorization.

218401424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1203 (or 620 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 26.

The square root of 218401424 is about 14778.4107399950. The cubic root of 218401424 is about 602.2153510399.

The spelling of 218401424 in words is "two hundred eighteen million, four hundred one thousand, four hundred twenty-four".