149905 has 8 divisors (see below), whose sum is σ = 205632. Its totient is φ = 102768.

The previous prime is 149899. The next prime is 149909. The reversal of 149905 is 509941.

149905 = 38² + 39² + ... + 79².

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

It is a cyclic number.

It is not a de Polignac number, because 149905 - 2⁵ = 149873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (149909) 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 7 ways as a sum of consecutive naturals, for example, 2107 + ... + 2176.

It is an arithmetic number, because the mean of its divisors is an integer number (25704).

2¹⁴⁹⁹⁰⁵ is an apocalyptic number.

It is an amenable number.

149905 is a deficient number, since it is larger than the sum of its proper divisors (55727).

149905 is an equidigital number, since it uses as much as digits as its factorization.

149905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4295.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 149905 is about 387.1756707233. The cubic root of 149905 is about 53.1217091387.

Adding to 149905 its product of nonzero digits (1620), we get a triangular number (151525 = T₅₅₀).

The spelling of 149905 in words is "one hundred forty-nine thousand, nine hundred five".