4218493 has 4 divisors (see below), whose sum is σ = 4242240. Its totient is φ = 4194748.

The previous prime is 4218469. The next prime is 4218497. The reversal of 4218493 is 3948124.

It is the 839-th star number.

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 4218493 - 2²¹ = 2121341 is a prime.

It is an Ulam number.

It is a d-powerful number, because it can be written as 4⁷ + 2 + 1 + 8³ + 4¹¹ + 9³ + 3⁸ .

It is a Duffinian number.

4218493 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4218497) 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, 11605 + ... + 11962.

It is an arithmetic number, because the mean of its divisors is an integer number (1060560).

Almost surely, 2^4218493 is an apocalyptic number.

It is an amenable number.

4218493 is a deficient number, since it is larger than the sum of its proper divisors (23747).

4218493 is a wasteful number, since it uses less digits than its factorization.

4218493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23746.

The product of its digits is 6912, while the sum is 31.

The square root of 4218493 is about 2053.8970276039. The cubic root of 4218493 is about 161.5793205615.

The spelling of 4218493 in words is "four million, two hundred eighteen thousand, four hundred ninety-three".