142218493 has 4 divisors (see below), whose sum is σ = 142504000. Its totient is φ = 141932988.

The previous prime is 142218469. The next prime is 142218509. The reversal of 142218493 is 394812241.

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 142218493 - 2⁹ = 142217981 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 (142218443) 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, 142005 + ... + 143002.

It is an arithmetic number, because the mean of its divisors is an integer number (35626000).

Almost surely, 2^142218493 is an apocalyptic number.

It is an amenable number.

142218493 is a deficient number, since it is larger than the sum of its proper divisors (285507).

142218493 is an equidigital number, since it uses as much as digits as its factorization.

142218493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285506.

The product of its digits is 13824, while the sum is 34.

The square root of 142218493 is about 11925.5395265791. The cubic root of 142218493 is about 521.9777897999.

The spelling of 142218493 in words is "one hundred forty-two million, two hundred eighteen thousand, four hundred ninety-three".