142186857 has 4 divisors (see below), whose sum is σ = 189582480. Its totient is φ = 94791236.

The previous prime is 142186831. The next prime is 142186859. The reversal of 142186857 is 758681241.

142186857 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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: 758681241 = 3 ⋅252893747.

It is a cyclic number.

It is not a de Polignac number, because 142186857 - 2⁸ = 142186601 is a prime.

It is not an unprimeable number, because it can be changed into a prime (142186859) 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, 23697807 + ... + 23697812.

It is an arithmetic number, because the mean of its divisors is an integer number (47395620).

Almost surely, 2^142186857 is an apocalyptic number.

It is an amenable number.

142186857 is a deficient number, since it is larger than the sum of its proper divisors (47395623).

142186857 is an equidigital number, since it uses as much as digits as its factorization.

142186857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47395622.

The product of its digits is 107520, while the sum is 42.

The square root of 142186857 is about 11924.2130557953. The cubic root of 142186857 is about 521.9390828929.

The spelling of 142186857 in words is "one hundred forty-two million, one hundred eighty-six thousand, eight hundred fifty-seven".