217010940 has 48 divisors (see below), whose sum is σ = 609106848. Its totient is φ = 57729024.

The previous prime is 217010939. The next prime is 217010947. The reversal of 217010940 is 49010712.

It is a self number, because there is not a number n which added to its sum of digits gives 217010940.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217010947) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21804 + ... + 30156.

It is an arithmetic number, because the mean of its divisors is an integer number (12689726).

Almost surely, 2^217010940 is an apocalyptic number.

217010940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

217010940 is an abundant number, since it is smaller than the sum of its proper divisors (392095908).

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

217010940 is a wasteful number, since it uses less digits than its factorization.

217010940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8798 (or 8796 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 24.

The square root of 217010940 is about 14731.2911857719. The cubic root of 217010940 is about 600.9345990075.

The spelling of 217010940 in words is "two hundred seventeen million, ten thousand, nine hundred forty".