145138209 has 8 divisors (see below), whose sum is σ = 197635200. Its totient is φ = 94700016.

The previous prime is 145138181. The next prime is 145138261. The reversal of 145138209 is 902831541.

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

It is not a de Polignac number, because 145138209 - 2⁹ = 145137697 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 145138209.

It is not an unprimeable number, because it can be changed into a prime (145138709) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 514534 + ... + 514815.

It is an arithmetic number, because the mean of its divisors is an integer number (24704400).

Almost surely, 2^145138209 is an apocalyptic number.

It is an amenable number.

145138209 is a deficient number, since it is larger than the sum of its proper divisors (52496991).

145138209 is a wasteful number, since it uses less digits than its factorization.

145138209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1029399.

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 145138209 is about 12047.3320282957. The cubic root of 145138209 is about 525.5256522039.

It can be divided in two parts, 14513 and 8209, that added together give a palindrome (22722).

The spelling of 145138209 in words is "one hundred forty-five million, one hundred thirty-eight thousand, two hundred nine".