213908 has 12 divisors (see below), whose sum is σ = 381780. Its totient is φ = 104832.

The previous prime is 213901. The next prime is 213919. The reversal of 213908 is 809312.

It can be written as a sum of positive squares in 2 ways, for example, as 110224 + 103684 = 332^2 + 322^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213901) by changing a digit.

213908 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, 293 + ... + 716.

It is an arithmetic number, because the mean of its divisors is an integer number (31815).

2²¹³⁹⁰⁸ is an apocalyptic number.

It is an amenable number.

213908 is a deficient number, since it is larger than the sum of its proper divisors (167872).

213908 is a wasteful number, since it uses less digits than its factorization.

213908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1066 (or 1064 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 213908 is about 462.5018918880. The cubic root of 213908 is about 59.8056675575.

The spelling of 213908 in words is "two hundred thirteen thousand, nine hundred eight".