213669 has 6 divisors (see below), whose sum is σ = 308646. Its totient is φ = 142440.

The previous prime is 213659. The next prime is 213713. The reversal of 213669 is 966312.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 213444 + 225 = 462^2 + 15^2 .

It is not a de Polignac number, because 213669 - 2⁵ = 213637 is a prime.

It is a super-2 number, since 2×213669² = 91308883122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213649) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11862 + ... + 11879.

It is an arithmetic number, because the mean of its divisors is an integer number (51441).

2²¹³⁶⁶⁹ is an apocalyptic number.

It is an amenable number.

213669 is a deficient number, since it is larger than the sum of its proper divisors (94977).

213669 is a wasteful number, since it uses less digits than its factorization.

213669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23747 (or 23744 counting only the distinct ones).

The product of its digits is 1944, while the sum is 27.

The square root of 213669 is about 462.2434423548. The cubic root of 213669 is about 59.7833855776.

The spelling of 213669 in words is "two hundred thirteen thousand, six hundred sixty-nine".