213745 has 16 divisors (see below), whose sum is σ = 304128. Its totient is φ = 141120.

The previous prime is 213737. The next prime is 213751. The reversal of 213745 is 547312.

213745 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 213745 - 2³ = 213737 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 987 + ... + 1183.

It is an arithmetic number, because the mean of its divisors is an integer number (19008).

2²¹³⁷⁴⁵ is an apocalyptic number.

It is an amenable number.

213745 is a deficient number, since it is larger than the sum of its proper divisors (90383).

213745 is a wasteful number, since it uses less digits than its factorization.

213745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240.

The product of its digits is 840, while the sum is 22.

The square root of 213745 is about 462.3256428103. The cubic root of 213745 is about 59.7904728617.

The spelling of 213745 in words is "two hundred thirteen thousand, seven hundred forty-five".