217840054 has 16 divisors (see below), whose sum is σ = 355820400. Its totient is φ = 99628704.

The previous prime is 217840027. The next prime is 217840079. The reversal of 217840054 is 450048712.

It is a junction number, because it is equal to n+sod(n) for n = 217839998 and 217840025.

It is a congruent number.

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, 97737 + ... + 99940.

It is an arithmetic number, because the mean of its divisors is an integer number (22238775).

Almost surely, 2^217840054 is an apocalyptic number.

217840054 is a deficient number, since it is larger than the sum of its proper divisors (137980346).

217840054 is a wasteful number, since it uses less digits than its factorization.

217840054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197727.

The product of its (nonzero) digits is 8960, while the sum is 31.

The square root of 217840054 is about 14759.4056113381. The cubic root of 217840054 is about 601.6989385097.

Adding to 217840054 its reverse (450048712), we get a palindrome (667888766).

The spelling of 217840054 in words is "two hundred seventeen million, eight hundred forty thousand, fifty-four".