142138857 has 32 divisors (see below), whose sum is σ = 225792000. Its totient is φ = 79467024.

The previous prime is 142138823. The next prime is 142138859. The reversal of 142138857 is 758831241.

It is not a de Polignac number, because 142138857 - 2¹¹ = 142136809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (142138859) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 46894 + ... + 49832.

It is an arithmetic number, because the mean of its divisors is an integer number (7056000).

Almost surely, 2^142138857 is an apocalyptic number.

It is an amenable number.

142138857 is a deficient number, since it is larger than the sum of its proper divisors (83653143).

142138857 is an equidigital number, since it uses as much as digits as its factorization.

142138857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3010 (or 2996 counting only the distinct ones).

The product of its digits is 53760, while the sum is 39.

The square root of 142138857 is about 11922.2001744644. The cubic root of 142138857 is about 521.8803435312.

The spelling of 142138857 in words is "one hundred forty-two million, one hundred thirty-eight thousand, eight hundred fifty-seven".