142731026 has 4 divisors (see below), whose sum is σ = 214096542. Its totient is φ = 71365512.

The previous prime is 142731007. The next prime is 142731047. The reversal of 142731026 is 620137241.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 620137241 = 139 ⋅4461419.

It can be written as a sum of positive squares in only one way, i.e., 141729025 + 1002001 = 11905^2 + 1001^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 142730986 and 142731004.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 35682755 + ... + 35682758.

Almost surely, 2^142731026 is an apocalyptic number.

142731026 is a deficient number, since it is larger than the sum of its proper divisors (71365516).

142731026 is an equidigital number, since it uses as much as digits as its factorization.

142731026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71365515.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 142731026 is about 11947.0090817744. The cubic root of 142731026 is about 522.6040799050.

Adding to 142731026 its reverse (620137241), we get a palindrome (762868267).

The spelling of 142731026 in words is "one hundred forty-two million, seven hundred thirty-one thousand, twenty-six".