149209 has 8 divisors (see below), whose sum is σ = 161568. Its totient is φ = 137280.

The previous prime is 149197. The next prime is 149213. The reversal of 149209 is 902941.

149209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-149209 is a prime.

It is a nialpdrome in base 8.

It is not an unprimeable number, because it can be changed into a prime (149239) 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, 1074 + ... + 1204.

It is an arithmetic number, because the mean of its divisors is an integer number (20196).

2¹⁴⁹²⁰⁹ is an apocalyptic number.

It is an amenable number.

149209 is a deficient number, since it is larger than the sum of its proper divisors (12359).

149209 is a wasteful number, since it uses less digits than its factorization.

149209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 149209 is about 386.2758081993. The cubic root of 149209 is about 53.0393679264.

The spelling of 149209 in words is "one hundred forty-nine thousand, two hundred nine".