213508 has 6 divisors (see below), whose sum is σ = 373646. Its totient is φ = 106752.

The previous prime is 213491. The next prime is 213523. The reversal of 213508 is 805312.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 213444 + 64 = 462^2 + 8^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26685 + ... + 26692.

2²¹³⁵⁰⁸ is an apocalyptic number.

It is an amenable number.

213508 is a deficient number, since it is larger than the sum of its proper divisors (160138).

213508 is a wasteful number, since it uses less digits than its factorization.

213508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53381 (or 53379 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 213508 is about 462.0692588779. The cubic root of 213508 is about 59.7683661728.

The spelling of 213508 in words is "two hundred thirteen thousand, five hundred eight".