149805 has 12 divisors (see below), whose sum is σ = 259740. Its totient is φ = 79872.

The previous prime is 149803. The next prime is 149827. The reversal of 149805 is 508941.

It can be written as a sum of positive squares in 2 ways, for example, as 56169 + 93636 = 237^2 + 306^2 .

It is not a de Polignac number, because 149805 - 2¹ = 149803 is a prime.

It is a plaindrome in base 8.

It is a zygodrome in base 8.

It is a congruent number.

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

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1620 + ... + 1709.

It is an arithmetic number, because the mean of its divisors is an integer number (21645).

2¹⁴⁹⁸⁰⁵ is an apocalyptic number.

149805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

149805 is a deficient number, since it is larger than the sum of its proper divisors (109935).

149805 is a wasteful number, since it uses less digits than its factorization.

149805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3340 (or 3337 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 149805 is about 387.0465088332. The cubic root of 149805 is about 53.1098942057.

The spelling of 149805 in words is "one hundred forty-nine thousand, eight hundred five".