213870385 has 8 divisors (see below), whose sum is σ = 258129000. Its totient is φ = 170106624.

The previous prime is 213870383. The next prime is 213870409. The reversal of 213870385 is 583078312.

It can be written as a sum of positive squares in 4 ways, for example, as 7890481 + 205979904 = 2809^2 + 14352^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 213870385 - 2¹ = 213870383 is a prime.

It is not an unprimeable number, because it can be changed into a prime (213870383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 122760 + ... + 124489.

It is an arithmetic number, because the mean of its divisors is an integer number (32266125).

Almost surely, 2^213870385 is an apocalyptic number.

It is an amenable number.

213870385 is a deficient number, since it is larger than the sum of its proper divisors (44258615).

213870385 is a wasteful number, since it uses less digits than its factorization.

213870385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247427.

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 213870385 is about 14624.3080178175. The cubic root of 213870385 is about 598.0216181042.

The spelling of 213870385 in words is "two hundred thirteen million, eight hundred seventy thousand, three hundred eighty-five".