217162340 has 12 divisors (see below), whose sum is σ = 456040956. Its totient is φ = 86864928.

The previous prime is 217162321. The next prime is 217162373. The reversal of 217162340 is 43261712.

It can be written as a sum of positive squares in 2 ways, for example, as 155351296 + 61811044 = 12464^2 + 7862^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5429039 + ... + 5429078.

It is an arithmetic number, because the mean of its divisors is an integer number (38003413).

Almost surely, 2^217162340 is an apocalyptic number.

217162340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

217162340 is an abundant number, since it is smaller than the sum of its proper divisors (238878616).

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

217162340 is a wasteful number, since it uses less digits than its factorization.

217162340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10858126 (or 10858124 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 217162340 is about 14736.4290111275. The cubic root of 217162340 is about 601.0743160012.

The spelling of 217162340 in words is "two hundred seventeen million, one hundred sixty-two thousand, three hundred forty".