142957889 has 4 divisors (see below), whose sum is σ = 143325780. Its totient is φ = 142590000.

The previous prime is 142957853. The next prime is 142957897. The reversal of 142957889 is 988759241.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 988759241 = 19919 ⋅49639.

It can be written as a sum of positive squares in 2 ways, for example, as 60964864 + 81993025 = 7808^2 + 9055^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-142957889 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 142957889.

It is not an unprimeable number, because it can be changed into a prime (142957189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 183362 + ... + 184139.

It is an arithmetic number, because the mean of its divisors is an integer number (35831445).

Almost surely, 2^142957889 is an apocalyptic number.

It is an amenable number.

142957889 is a deficient number, since it is larger than the sum of its proper divisors (367891).

142957889 is an equidigital number, since it uses as much as digits as its factorization.

142957889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 367890.

The product of its digits is 1451520, while the sum is 53.

The square root of 142957889 is about 11956.4998640907. The cubic root of 142957889 is about 522.8808166771.

The spelling of 142957889 in words is "one hundred forty-two million, nine hundred fifty-seven thousand, eight hundred eighty-nine".