218968042 has 4 divisors (see below), whose sum is σ = 328452066. Its totient is φ = 109484020.

The previous prime is 218968039. The next prime is 218968049. The reversal of 218968042 is 240869812.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 168714121 + 50253921 = 12989^2 + 7089^2 .

It is a junction number, because it is equal to n+sod(n) for n = 218967986 and 218968004.

It is not an unprimeable number, because it can be changed into a prime (218968049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54742009 + ... + 54742012.

Almost surely, 2^218968042 is an apocalyptic number.

218968042 is a deficient number, since it is larger than the sum of its proper divisors (109484024).

218968042 is a wasteful number, since it uses less digits than its factorization.

218968042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109484023.

The product of its (nonzero) digits is 55296, while the sum is 40.

The square root of 218968042 is about 14797.5687867974. The cubic root of 218968042 is about 602.7356947038.

The spelling of 218968042 in words is "two hundred eighteen million, nine hundred sixty-eight thousand, forty-two".