142749305 has 4 divisors (see below), whose sum is σ = 171299172. Its totient is φ = 114199440.

The previous prime is 142749283. The next prime is 142749349. The reversal of 142749305 is 503947241.

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 52954729 + 89794576 = 7277^2 + 9476^2 .

It is not a de Polignac number, because 142749305 - 2⁶ = 142749241 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14274926 + ... + 14274935.

It is an arithmetic number, because the mean of its divisors is an integer number (42824793).

Almost surely, 2^142749305 is an apocalyptic number.

It is an amenable number.

142749305 is a deficient number, since it is larger than the sum of its proper divisors (28549867).

142749305 is an equidigital number, since it uses as much as digits as its factorization.

142749305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28549866.

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 142749305 is about 11947.7740604683. The cubic root of 142749305 is about 522.6263882344.

The spelling of 142749305 in words is "one hundred forty-two million, seven hundred forty-nine thousand, three hundred five".