149605 has 4 divisors (see below), whose sum is σ = 179532. Its totient is φ = 119680.

The previous prime is 149603. The next prime is 149623. The reversal of 149605 is 506941.

149605 = 273² + 274².

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 74529 + 75076 = 273^2 + 274^2 .

It is not a de Polignac number, because 149605 - 2¹ = 149603 is a prime.

It is a Duffinian number.

149605 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 149605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (149603) 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, 14956 + ... + 14965.

It is an arithmetic number, because the mean of its divisors is an integer number (44883).

2¹⁴⁹⁶⁰⁵ is an apocalyptic number.

149605 is the 274-th centered square number.

It is an amenable number.

149605 is a deficient number, since it is larger than the sum of its proper divisors (29927).

149605 is an equidigital number, since it uses as much as digits as its factorization.

149605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29926.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 149605 is about 386.7880556584. The cubic root of 149605 is about 53.0862485567.

The spelling of 149605 in words is "one hundred forty-nine thousand, six hundred five".