217469340 has 192 divisors, whose sum is σ = 762531840. Its totient is φ = 50976000.

The previous prime is 217469333. The next prime is 217469407. The reversal of 217469340 is 43964712.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 217469295 and 217469304.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 183550 + ... + 184730.

It is an arithmetic number, because the mean of its divisors is an integer number (3971520).

Almost surely, 2^217469340 is an apocalyptic number.

217469340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 217469340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (381265920).

217469340 is an abundant number, since it is smaller than the sum of its proper divisors (545062500).

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

217469340 is a wasteful number, since it uses less digits than its factorization.

217469340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1241 (or 1233 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The square root of 217469340 is about 14746.8416957666. The cubic root of 217469340 is about 601.3574266721.

The spelling of 217469340 in words is "two hundred seventeen million, four hundred sixty-nine thousand, three hundred forty".