142449257 has 4 divisors (see below), whose sum is σ = 142534800. Its totient is φ = 142363716.

The previous prime is 142449227. The next prime is 142449271. The reversal of 142449257 is 752944241.

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 142449257 - 2¹⁸ = 142187113 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 142449257.

It is not an unprimeable number, because it can be changed into a prime (142449227) 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, 40223 + ... + 43620.

It is an arithmetic number, because the mean of its divisors is an integer number (35633700).

Almost surely, 2^142449257 is an apocalyptic number.

It is an amenable number.

142449257 is a deficient number, since it is larger than the sum of its proper divisors (85543).

142449257 is an equidigital number, since it uses as much as digits as its factorization.

142449257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85542.

The product of its digits is 80640, while the sum is 38.

The square root of 142449257 is about 11935.2108066846. The cubic root of 142449257 is about 522.2599579609.

The spelling of 142449257 in words is "one hundred forty-two million, four hundred forty-nine thousand, two hundred fifty-seven".