145239209 has 8 divisors (see below), whose sum is σ = 147941760. Its totient is φ = 142558416.

The previous prime is 145239197. The next prime is 145239223. The reversal of 145239209 is 902932541.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 145239209 - 2⁸ = 145238953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145239299) 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 7 ways as a sum of consecutive naturals, for example, 8354 + ... + 18980.

It is an arithmetic number, because the mean of its divisors is an integer number (18492720).

Almost surely, 2^145239209 is an apocalyptic number.

It is an amenable number.

145239209 is a deficient number, since it is larger than the sum of its proper divisors (2702551).

145239209 is a wasteful number, since it uses less digits than its factorization.

145239209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10879.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 145239209 is about 12051.5230987622. The cubic root of 145239209 is about 525.6475263446.

It can be divided in two parts, 14523 and 9209, that added together give a palindrome (23732).

The spelling of 145239209 in words is "one hundred forty-five million, two hundred thirty-nine thousand, two hundred nine".