213727397 has 8 divisors (see below), whose sum is σ = 231636216. Its totient is φ = 196028352.

The previous prime is 213727391. The next prime is 213727421. The reversal of 213727397 is 793727312.

It can be written as a sum of positive squares in 4 ways, for example, as 5387041 + 208340356 = 2321^2 + 14434^2 .

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

It is not a de Polignac number, because 213727397 - 2¹⁸ = 213465253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213727391) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50318 + ... + 54399.

It is an arithmetic number, because the mean of its divisors is an integer number (28954527).

Almost surely, 2^213727397 is an apocalyptic number.

It is an amenable number.

213727397 is a deficient number, since it is larger than the sum of its proper divisors (17908819).

213727397 is a wasteful number, since it uses less digits than its factorization.

213727397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104887.

The product of its digits is 111132, while the sum is 41.

The square root of 213727397 is about 14619.4184904872. The cubic root of 213727397 is about 597.8883146569. Note that the first 3 decimals are identical.

The spelling of 213727397 in words is "two hundred thirteen million, seven hundred twenty-seven thousand, three hundred ninety-seven".