142138671 has 4 divisors (see below), whose sum is σ = 189518232. Its totient is φ = 94759112.

The previous prime is 142138651. The next prime is 142138681. The reversal of 142138671 is 176831241.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 142138671 - 2⁹ = 142138159 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142138631) 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, 23689776 + ... + 23689781.

It is an arithmetic number, because the mean of its divisors is an integer number (47379558).

Almost surely, 2^142138671 is an apocalyptic number.

142138671 is a deficient number, since it is larger than the sum of its proper divisors (47379561).

142138671 is an equidigital number, since it uses as much as digits as its factorization.

142138671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47379560.

The product of its digits is 8064, while the sum is 33.

The square root of 142138671 is about 11922.1923738883. The cubic root of 142138671 is about 521.8801158904.

The spelling of 142138671 in words is "one hundred forty-two million, one hundred thirty-eight thousand, six hundred seventy-one".