213965 has 4 divisors (see below), whose sum is σ = 256764. Its totient is φ = 171168.

The previous prime is 213953. The next prime is 213973. The reversal of 213965 is 569312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 94249 + 119716 = 307^2 + 346^2 .

It is a cyclic number.

It is not a de Polignac number, because 213965 - 2⁴ = 213949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 213965.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21392 + ... + 21401.

It is an arithmetic number, because the mean of its divisors is an integer number (64191).

2²¹³⁹⁶⁵ is an apocalyptic number.

It is an amenable number.

213965 is a deficient number, since it is larger than the sum of its proper divisors (42799).

213965 is an equidigital number, since it uses as much as digits as its factorization.

213965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42798.

The product of its digits is 1620, while the sum is 26.

The square root of 213965 is about 462.5635091531. The cubic root of 213965 is about 59.8109792185.

The spelling of 213965 in words is "two hundred thirteen thousand, nine hundred sixty-five".