213969 has 16 divisors (see below), whose sum is σ = 340992. Its totient is φ = 116688.

The previous prime is 213953. The next prime is 213973. The reversal of 213969 is 969312.

213969 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 213969 - 2⁴ = 213953 is a prime.

It is a super-2 number, since 2×213969² = 91565465922, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (213919) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 262 + ... + 704.

It is an arithmetic number, because the mean of its divisors is an integer number (21312).

2²¹³⁹⁶⁹ is an apocalyptic number.

It is an amenable number.

213969 is a deficient number, since it is larger than the sum of its proper divisors (127023).

213969 is a wasteful number, since it uses less digits than its factorization.

213969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 476.

The product of its digits is 2916, while the sum is 30.

The square root of 213969 is about 462.5678328635. The cubic root of 213969 is about 59.8113519312.

The spelling of 213969 in words is "two hundred thirteen thousand, nine hundred sixty-nine".