149809 has 4 divisors (see below), whose sum is σ = 163440. Its totient is φ = 136180.

The previous prime is 149803. The next prime is 149827. The reversal of 149809 is 908941.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 149809 - 2⁹ = 149297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (149803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6799 + ... + 6820.

It is an arithmetic number, because the mean of its divisors is an integer number (40860).

2¹⁴⁹⁸⁰⁹ is an apocalyptic number.

It is an amenable number.

149809 is a deficient number, since it is larger than the sum of its proper divisors (13631).

149809 is a wasteful number, since it uses less digits than its factorization.

149809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13630.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 149809 is about 387.0516761364. The cubic root of 149809 is about 53.1103669040.

The spelling of 149809 in words is "one hundred forty-nine thousand, eight hundred nine".