142186789 has 2 divisors, whose sum is σ = 142186790. Its totient is φ = 142186788.

The previous prime is 142186783. The next prime is 142186799. The reversal of 142186789 is 987681241.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 90820900 + 51365889 = 9530^2 + 7167^2 .

It is an emirp because it is prime and its reverse (987681241) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 142186789 - 2⁹ = 142186277 is a prime.

It is a super-2 number, since 2×142186789² = 40434165932261042, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (142186783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71093394 + 71093395.

It is an arithmetic number, because the mean of its divisors is an integer number (71093395).

Almost surely, 2^142186789 is an apocalyptic number.

It is an amenable number.

142186789 is a deficient number, since it is larger than the sum of its proper divisors (1).

142186789 is an equidigital number, since it uses as much as digits as its factorization.

142186789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 193536, while the sum is 46.

The square root of 142186789 is about 11924.2102044538. The cubic root of 142186789 is about 521.9389996882.

The spelling of 142186789 in words is "one hundred forty-two million, one hundred eighty-six thousand, seven hundred eighty-nine".