142985405 has 4 divisors (see below), whose sum is σ = 171582492. Its totient is φ = 114388320.

The previous prime is 142985389. The next prime is 142985407. The reversal of 142985405 is 504589241.

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 95140516 + 47844889 = 9754^2 + 6917^2 .

It is not a de Polignac number, because 142985405 - 2⁴ = 142985389 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 (142985407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14298536 + ... + 14298545.

It is an arithmetic number, because the mean of its divisors is an integer number (42895623).

Almost surely, 2^142985405 is an apocalyptic number.

It is an amenable number.

142985405 is a deficient number, since it is larger than the sum of its proper divisors (28597087).

142985405 is an equidigital number, since it uses as much as digits as its factorization.

142985405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28597086.

The product of its (nonzero) digits is 57600, while the sum is 38.

The square root of 142985405 is about 11957.6504799229. The cubic root of 142985405 is about 522.9143619065.

The spelling of 142985405 in words is "one hundred forty-two million, nine hundred eighty-five thousand, four hundred five".