142730809 has 9 divisors (see below), whose sum is σ = 154723023. Its totient is φ = 131608152.

The previous prime is 142730807. The next prime is 142730821. The reversal of 142730809 is 908037241.

The square root of 142730809 is 11947.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 21114025 + 121616784 = 4595^2 + 11028^2 .

It is not a de Polignac number, because 142730809 - 2¹ = 142730807 is a prime.

It is not an unprimeable number, because it can be changed into a prime (142730807) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 154852 + ... + 155770.

It is an arithmetic number, because the mean of its divisors is an integer number (17191447).

Almost surely, 2^142730809 is an apocalyptic number.

142730809 is the 11947-th square number.

142730809 is the 5974-th centered octagonal number.

It is an amenable number.

142730809 is a deficient number, since it is larger than the sum of its proper divisors (11992214).

142730809 is an frugal number, since it uses more digits than its factorization.

142730809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1864 (or 932 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 34.

The cubic root of 142730809 is about 522.6038150592.

The spelling of 142730809 in words is "one hundred forty-two million, seven hundred thirty thousand, eight hundred nine".