213240493 has 4 divisors (see below), whose sum is σ = 214919680. Its totient is φ = 211561308.

The previous prime is 213240487. The next prime is 213240497. The reversal of 213240493 is 394042312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 213240493 - 2⁹ = 213239981 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 (213240497) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 839403 + ... + 839656.

It is an arithmetic number, because the mean of its divisors is an integer number (53729920).

Almost surely, 2^213240493 is an apocalyptic number.

It is an amenable number.

213240493 is a deficient number, since it is larger than the sum of its proper divisors (1679187).

213240493 is a wasteful number, since it uses less digits than its factorization.

213240493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1679186.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 213240493 is about 14602.7563494020. The cubic root of 213240493 is about 597.4339421494.

The spelling of 213240493 in words is "two hundred thirteen million, two hundred forty thousand, four hundred ninety-three".