142623643 has 4 divisors (see below), whose sum is σ = 142650000. Its totient is φ = 142597288.

The previous prime is 142623623. The next prime is 142623661. The reversal of 142623643 is 346326241.

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-142623643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (142623623) 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, 1768 + ... + 16981.

It is an arithmetic number, because the mean of its divisors is an integer number (35662500).

Almost surely, 2^142623643 is an apocalyptic number.

142623643 is a deficient number, since it is larger than the sum of its proper divisors (26357).

142623643 is an equidigital number, since it uses as much as digits as its factorization.

142623643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26356.

The product of its digits is 20736, while the sum is 31.

The square root of 142623643 is about 11942.5140987985. The cubic root of 142623643 is about 522.4729874698.

Adding to 142623643 its reverse (346326241), we get a palindrome (488949884).

The spelling of 142623643 in words is "one hundred forty-two million, six hundred twenty-three thousand, six hundred forty-three".