218242156 has 12 divisors (see below), whose sum is σ = 416644200. Its totient is φ = 99200960.

The previous prime is 218242127. The next prime is 218242163. The reversal of 218242156 is 651242812.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2479981 + ... + 2480068.

It is an arithmetic number, because the mean of its divisors is an integer number (34720350).

Almost surely, 2^218242156 is an apocalyptic number.

It is an amenable number.

218242156 is a deficient number, since it is larger than the sum of its proper divisors (198402044).

218242156 is a wasteful number, since it uses less digits than its factorization.

218242156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4960064 (or 4960062 counting only the distinct ones).

The product of its digits is 7680, while the sum is 31.

The square root of 218242156 is about 14773.0212211314. The cubic root of 218242156 is about 602.0689280648.

Adding to 218242156 its reverse (651242812), we get a palindrome (869484968).

The spelling of 218242156 in words is "two hundred eighteen million, two hundred forty-two thousand, one hundred fifty-six".