213440893 has 4 divisors (see below), whose sum is σ = 213473788. Its totient is φ = 213408000.

The previous prime is 213440881. The next prime is 213440939. The reversal of 213440893 is 398044312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 42276004 + 171164889 = 6502^2 + 13083^2 .

It is a cyclic number.

It is not a de Polignac number, because 213440893 - 2¹³ = 213432701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213440873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3108 + ... + 20893.

It is an arithmetic number, because the mean of its divisors is an integer number (53368447).

Almost surely, 2^213440893 is an apocalyptic number.

It is an amenable number.

213440893 is a deficient number, since it is larger than the sum of its proper divisors (32895).

213440893 is an equidigital number, since it uses as much as digits as its factorization.

213440893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32894.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 213440893 is about 14609.6164562934. The cubic root of 213440893 is about 597.6210365023.

The spelling of 213440893 in words is "two hundred thirteen million, four hundred forty thousand, eight hundred ninety-three".