213428 has 12 divisors (see below), whose sum is σ = 376740. Its totient is φ = 105792.

The previous prime is 213407. The next prime is 213449. The reversal of 213428 is 824312.

It is an interprime number because it is at equal distance from previous prime (213407) and next prime (213449).

It can be written as a sum of positive squares in 2 ways, for example, as 128164 + 85264 = 358^2 + 292^2 .

It is a super-2 number, since 2×213428² = 91103022368, which contains 22 as substring.

It is a plaindrome in base 14.

It is a congruent number.

It is an unprimeable number.

213428 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 800 + ... + 1032.

It is an arithmetic number, because the mean of its divisors is an integer number (31395).

2²¹³⁴²⁸ is an apocalyptic number.

It is an amenable number.

213428 is a deficient number, since it is larger than the sum of its proper divisors (163312).

213428 is a wasteful number, since it uses less digits than its factorization.

213428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 466 (or 464 counting only the distinct ones).

The product of its digits is 384, while the sum is 20.

The square root of 213428 is about 461.9826836582. The cubic root of 213428 is about 59.7609003064.

The spelling of 213428 in words is "two hundred thirteen thousand, four hundred twenty-eight".