218970925 has 12 divisors (see below), whose sum is σ = 283330080. Its totient is φ = 167559920.

The previous prime is 218970881. The next prime is 218970943. The reversal of 218970925 is 529079812.

It is not a de Polignac number, because 218970925 - 2⁷ = 218970797 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 189835 + ... + 190984.

It is an arithmetic number, because the mean of its divisors is an integer number (23610840).

Almost surely, 2^218970925 is an apocalyptic number.

218970925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

218970925 is a deficient number, since it is larger than the sum of its proper divisors (64359155).

218970925 is a wasteful number, since it uses less digits than its factorization.

218970925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380852 (or 380847 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 43.

The square root of 218970925 is about 14797.6662011278. Note that the first 3 decimals coincide. The cubic root of 218970925 is about 602.7383399595.

The spelling of 218970925 in words is "two hundred eighteen million, nine hundred seventy thousand, nine hundred twenty-five".