142637993 has 2 divisors, whose sum is σ = 142637994. Its totient is φ = 142637992.

The previous prime is 142637977. The next prime is 142638011. The reversal of 142637993 is 399736241.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 107910544 + 34727449 = 10388^2 + 5893^2 .

It is a cyclic number.

It is not a de Polignac number, because 142637993 - 2⁴ = 142637977 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (142637933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71318996 + 71318997.

It is an arithmetic number, because the mean of its divisors is an integer number (71318997).

Almost surely, 2^142637993 is an apocalyptic number.

It is an amenable number.

142637993 is a deficient number, since it is larger than the sum of its proper divisors (1).

142637993 is an equidigital number, since it uses as much as digits as its factorization.

142637993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 244944, while the sum is 44.

The square root of 142637993 is about 11943.1148784561. The cubic root of 142637993 is about 522.4905096603.

The spelling of 142637993 in words is "one hundred forty-two million, six hundred thirty-seven thousand, nine hundred ninety-three".