213239965 has 8 divisors (see below), whose sum is σ = 255970008. Its totient is φ = 170537280.

The previous prime is 213239963. The next prime is 213239981. The reversal of 213239965 is 569932312.

It can be written as a sum of positive squares in 4 ways, for example, as 107931321 + 105308644 = 10389^2 + 10262^2 .

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

It is not a de Polignac number, because 213239965 - 2¹ = 213239963 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 (213239963) 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, 19635 + ... + 28495.

It is an arithmetic number, because the mean of its divisors is an integer number (31996251).

Almost surely, 2^213239965 is an apocalyptic number.

It is an amenable number.

213239965 is a deficient number, since it is larger than the sum of its proper divisors (42730043).

213239965 is an equidigital number, since it uses as much as digits as its factorization.

213239965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13679.

The product of its digits is 87480, while the sum is 40.

The square root of 213239965 is about 14602.7382706121. The cubic root of 213239965 is about 597.4334490514.

The spelling of 213239965 in words is "two hundred thirteen million, two hundred thirty-nine thousand, nine hundred sixty-five".