218161938 has 16 divisors (see below), whose sum is σ = 436519296. Its totient is φ = 72688080.

The previous prime is 218161907. The next prime is 218161949. The reversal of 218161938 is 839161812.

It is a junction number, because it is equal to n+sod(n) for n = 218161896 and 218161905.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9220 + ... + 22832.

It is an arithmetic number, because the mean of its divisors is an integer number (27282456).

Almost surely, 2^218161938 is an apocalyptic number.

218161938 is an abundant number, since it is smaller than the sum of its proper divisors (218357358).

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

218161938 is a wasteful number, since it uses less digits than its factorization.

218161938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16289.

The product of its digits is 20736, while the sum is 39.

The square root of 218161938 is about 14770.3059548542. The cubic root of 218161938 is about 601.9951527003.

The spelling of 218161938 in words is "two hundred eighteen million, one hundred sixty-one thousand, nine hundred thirty-eight".