218939190 has 16 divisors (see below), whose sum is σ = 525454128. Its totient is φ = 58383776.

The previous prime is 218939179. The next prime is 218939197. The reversal of 218939190 is 91939812.

It is a super-2 number, since 2×218939190² = 95868737835712200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218939197) 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, 3648957 + ... + 3649016.

It is an arithmetic number, because the mean of its divisors is an integer number (32840883).

Almost surely, 2^218939190 is an apocalyptic number.

218939190 is an abundant number, since it is smaller than the sum of its proper divisors (306514938).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

218939190 is a wasteful number, since it uses less digits than its factorization.

218939190 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7297983.

The product of its (nonzero) digits is 34992, while the sum is 42.

The square root of 218939190 is about 14796.5938648055. The cubic root of 218939190 is about 602.7092206820.

The spelling of 218939190 in words is "two hundred eighteen million, nine hundred thirty-nine thousand, one hundred ninety".