218197642 has 16 divisors (see below), whose sum is σ = 367799040. Its totient is φ = 96327792.

The previous prime is 218197633. The next prime is 218197643. The reversal of 218197642 is 246791812.

218197642 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×218197642² = 95220421948720328, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 218197595 and 218197604.

It is not an unprimeable number, because it can be changed into a prime (218197643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 181842 + ... + 183037.

It is an arithmetic number, because the mean of its divisors is an integer number (22987440).

Almost surely, 2^218197642 is an apocalyptic number.

218197642 is a deficient number, since it is larger than the sum of its proper divisors (149601398).

218197642 is a wasteful number, since it uses less digits than its factorization.

218197642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364917.

The product of its digits is 48384, while the sum is 40.

The square root of 218197642 is about 14771.5145465859. The cubic root of 218197642 is about 602.0279913990.

The spelling of 218197642 in words is "two hundred eighteen million, one hundred ninety-seven thousand, six hundred forty-two".