218154490 has 8 divisors (see below), whose sum is σ = 392678100. Its totient is φ = 87261792.

The previous prime is 218154407. The next prime is 218154499. The reversal of 218154490 is 94451812.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 216648961 + 1505529 = 14719^2 + 1227^2 .

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

It is not an unprimeable number, because it can be changed into a prime (218154499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10907715 + ... + 10907734.

Almost surely, 2^218154490 is an apocalyptic number.

218154490 is a deficient number, since it is larger than the sum of its proper divisors (174523610).

218154490 is a wasteful number, since it uses less digits than its factorization.

218154490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21815456.

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 218154490 is about 14770.0538252235. The cubic root of 218154490 is about 601.9883019621.

The spelling of 218154490 in words is "two hundred eighteen million, one hundred fifty-four thousand, four hundred ninety".