142830731 has 4 divisors (see below), whose sum is σ = 143153592. Its totient is φ = 142507872.

The previous prime is 142830691. The next prime is 142830739. The reversal of 142830731 is 137038241.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-142830731 is a prime.

It is a super-2 number, since 2×142830731² = 40801235435988722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 142830694 and 142830703.

It is not an unprimeable number, because it can be changed into a prime (142830739) 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, 160766 + ... + 161651.

It is an arithmetic number, because the mean of its divisors is an integer number (35788398).

Almost surely, 2^142830731 is an apocalyptic number.

142830731 is a deficient number, since it is larger than the sum of its proper divisors (322861).

142830731 is an equidigital number, since it uses as much as digits as its factorization.

142830731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322860.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 142830731 is about 11951.1811550156. The cubic root of 142830731 is about 522.7257402359.

Adding to 142830731 its reverse (137038241), we get a palindrome (279868972).

The spelling of 142830731 in words is "one hundred forty-two million, eight hundred thirty thousand, seven hundred thirty-one".