217379380 has 24 divisors (see below), whose sum is σ = 480523680. Its totient is φ = 82375200.

The previous prime is 217379377. The next prime is 217379401. The reversal of 217379380 is 83973712.

It is a congruent number.

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, 285646 + ... + 286405.

It is an arithmetic number, because the mean of its divisors is an integer number (20021820).

Almost surely, 2^217379380 is an apocalyptic number.

217379380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

217379380 is an abundant number, since it is smaller than the sum of its proper divisors (263144300).

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

217379380 is a wasteful number, since it uses less digits than its factorization.

217379380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 572079 (or 572077 counting only the distinct ones).

The product of its (nonzero) digits is 63504, while the sum is 40.

The square root of 217379380 is about 14743.7912356354. The cubic root of 217379380 is about 601.2744945595.

The spelling of 217379380 in words is "two hundred seventeen million, three hundred seventy-nine thousand, three hundred eighty".