213490 has 16 divisors (see below), whose sum is σ = 395352. Its totient is φ = 82944.

The previous prime is 213481. The next prime is 213491. The reversal of 213490 is 94312.

213490 = T₁₃₆ + T₁₃₇ + ... + T₁₅₅.

213490 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 210681 + 2809 = 459^2 + 53^2 .

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213491) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82 + ... + 658.

2²¹³⁴⁹⁰ is an apocalyptic number.

213490 is a deficient number, since it is larger than the sum of its proper divisors (181862).

213490 is a wasteful number, since it uses less digits than its factorization.

213490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 213490 is about 462.0497808678. The cubic root of 213490 is about 59.7666865155.

It can be divided in two parts, 213 and 490, that added together give a triangular number (703 = T₃₇).

The spelling of 213490 in words is "two hundred thirteen thousand, four hundred ninety".