142326721 has 4 divisors (see below), whose sum is σ = 142369492. Its totient is φ = 142283952.

The previous prime is 142326719. The next prime is 142326727. The reversal of 142326721 is 127623241.

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

It can be written as a sum of positive squares in 2 ways, for example, as 69889600 + 72437121 = 8360^2 + 8511^2 .

It is a cyclic number.

It is not a de Polignac number, because 142326721 - 2¹ = 142326719 is a prime.

It is a super-2 number, since 2×142326721² = 40513791021223682, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 142326721.

It is not an unprimeable number, because it can be changed into a prime (142326727) 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, 15930 + ... + 23203.

It is an arithmetic number, because the mean of its divisors is an integer number (35592373).

Almost surely, 2^142326721 is an apocalyptic number.

It is an amenable number.

142326721 is a deficient number, since it is larger than the sum of its proper divisors (42771).

142326721 is an equidigital number, since it uses as much as digits as its factorization.

142326721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42770.

The product of its digits is 4032, while the sum is 28.

The square root of 142326721 is about 11930.0763199571. The cubic root of 142326721 is about 522.1101642585.

Adding to 142326721 its reverse (127623241), we get a palindrome (269949962).

The spelling of 142326721 in words is "one hundred forty-two million, three hundred twenty-six thousand, seven hundred twenty-one".