215020194 has 8 divisors (see below), whose sum is σ = 430040400. Its totient is φ = 71673396.

The previous prime is 215020187. The next prime is 215020231. The reversal of 215020194 is 491020512.

It is a sphenic number, since it is the product of 3 distinct primes.

215020194 is an admirable number.

It is a Curzon number.

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, 17918344 + ... + 17918355.

It is an arithmetic number, because the mean of its divisors is an integer number (53755050).

Almost surely, 2^215020194 is an apocalyptic number.

215020194 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

215020194 is a wasteful number, since it uses less digits than its factorization.

215020194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35836704.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 215020194 is about 14663.5668921310. The cubic root of 215020194 is about 599.0913969844.

The spelling of 215020194 in words is "two hundred fifteen million, twenty thousand, one hundred ninety-four".