142115405 has 4 divisors (see below), whose sum is σ = 170538492. Its totient is φ = 113692320.

The previous prime is 142115401. The next prime is 142115411. The reversal of 142115405 is 504511241.

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 73324969 + 68790436 = 8563^2 + 8294^2 .

It is not a de Polignac number, because 142115405 - 2² = 142115401 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142115401) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 14211536 + ... + 14211545.

It is an arithmetic number, because the mean of its divisors is an integer number (42634623).

Almost surely, 2^142115405 is an apocalyptic number.

It is an amenable number.

142115405 is a deficient number, since it is larger than the sum of its proper divisors (28423087).

142115405 is an equidigital number, since it uses as much as digits as its factorization.

142115405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28423086.

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 142115405 is about 11921.2165906001. The cubic root of 142115405 is about 521.8516396490.

Adding to 142115405 its reverse (504511241), we get a palindrome (646626646).

The spelling of 142115405 in words is "one hundred forty-two million, one hundred fifteen thousand, four hundred five".