142823249 has 4 divisors (see below), whose sum is σ = 143463936. Its totient is φ = 142182564.

The previous prime is 142823237. The next prime is 142823257. The reversal of 142823249 is 942328241.

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, and also an emirpimes, since its reverse is a distinct semiprime: 942328241 = 17 ⋅55431073.

It is a cyclic number.

It is not a de Polignac number, because 142823249 - 2²⁰ = 141774673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (142828249) 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, 320009 + ... + 320454.

It is an arithmetic number, because the mean of its divisors is an integer number (35865984).

Almost surely, 2^142823249 is an apocalyptic number.

It is an amenable number.

142823249 is a deficient number, since it is larger than the sum of its proper divisors (640687).

142823249 is an equidigital number, since it uses as much as digits as its factorization.

142823249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 640686.

The product of its digits is 27648, while the sum is 35.

The square root of 142823249 is about 11950.8681274625. The cubic root of 142823249 is about 522.7166126430.

The spelling of 142823249 in words is "one hundred forty-two million, eight hundred twenty-three thousand, two hundred forty-nine".