217234540 has 24 divisors (see below), whose sum is σ = 476028000. Its totient is φ = 83115648.

The previous prime is 217234531. The next prime is 217234559. The reversal of 217234540 is 45432712.

It is a junction number, because it is equal to n+sod(n) for n = 217234499 and 217234508.

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, 235665 + ... + 236584.

It is an arithmetic number, because the mean of its divisors is an integer number (19834500).

Almost surely, 2^217234540 is an apocalyptic number.

217234540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

217234540 is an abundant number, since it is smaller than the sum of its proper divisors (258793460).

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

217234540 is a wasteful number, since it uses less digits than its factorization.

217234540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 472281 (or 472279 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 28.

The square root of 217234540 is about 14738.8785190733. The cubic root of 217234540 is about 601.1409217135.

The spelling of 217234540 in words is "two hundred seventeen million, two hundred thirty-four thousand, five hundred forty".