217948142 has 8 divisors (see below), whose sum is σ = 327763800. Its totient is φ = 108693544.

The previous prime is 217948091. The next prime is 217948147. The reversal of 217948142 is 241849712.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 217948096 and 217948105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217948147) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 139292 + ... + 140847.

It is an arithmetic number, because the mean of its divisors is an integer number (40970475).

Almost surely, 2^217948142 is an apocalyptic number.

217948142 is a deficient number, since it is larger than the sum of its proper divisors (109815658).

217948142 is a wasteful number, since it uses less digits than its factorization.

217948142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280530.

The product of its digits is 32256, while the sum is 38.

The square root of 217948142 is about 14763.0668223103. The cubic root of 217948142 is about 601.7984391602.

The spelling of 217948142 in words is "two hundred seventeen million, nine hundred forty-eight thousand, one hundred forty-two".