217040404 has 36 divisors (see below), whose sum is σ = 443394336. Its totient is φ = 92688624.

The previous prime is 217040389. The next prime is 217040419. The reversal of 217040404 is 404040712.

It is an interprime number because it is at equal distance from previous prime (217040389) and next prime (217040419).

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, 58369 + ... + 61975.

Almost surely, 2^217040404 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 217040404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (221697168).

217040404 is an abundant number, since it is smaller than the sum of its proper divisors (226353932).

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

217040404 is a wasteful number, since it uses less digits than its factorization.

217040404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3932 (or 3923 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 22.

The square root of 217040404 is about 14732.2911999458. The cubic root of 217040404 is about 600.9617944656.

The spelling of 217040404 in words is "two hundred seventeen million, forty thousand, four hundred four".