213426 has 24 divisors (see below), whose sum is σ = 471744. Its totient is φ = 69720.

The previous prime is 213407. The next prime is 213449. The reversal of 213426 is 624312.

It is a happy number.

213426 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 213399 and 213408.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1195 + ... + 1361.

It is an arithmetic number, because the mean of its divisors is an integer number (19656).

2²¹³⁴²⁶ is an apocalyptic number.

213426 is an abundant number, since it is smaller than the sum of its proper divisors (258318).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

213426 is a wasteful number, since it uses less digits than its factorization.

213426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246 (or 243 counting only the distinct ones).

The product of its digits is 288, while the sum is 18.

The square root of 213426 is about 461.9805190698. The cubic root of 213426 is about 59.7607136359.

Adding to 213426 its sum of digits (18), we get a square (213444 = 462²).

Adding to 213426 its reverse (624312), we get a palindrome (837738).

The spelling of 213426 in words is "two hundred thirteen thousand, four hundred twenty-six".