149669 has 8 divisors (see below), whose sum is σ = 167160. Its totient is φ = 133056.

The previous prime is 149629. The next prime is 149689. The reversal of 149669 is 966941.

149669 = 63² + 64² + ... + 88².

It can be written as a sum of positive squares in 4 ways, for example, as 12769 + 136900 = 113^2 + 370^2 .

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-149669 is a prime.

It is a super-2 number, since 2×149669² = 44801619122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (149629) 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, 179 + ... + 575.

It is an arithmetic number, because the mean of its divisors is an integer number (20895).

2¹⁴⁹⁶⁶⁹ is an apocalyptic number.

It is an amenable number.

149669 is a deficient number, since it is larger than the sum of its proper divisors (17491).

149669 is a wasteful number, since it uses less digits than its factorization.

149669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439.

The product of its digits is 11664, while the sum is 35.

The square root of 149669 is about 386.8707794600. The cubic root of 149669 is about 53.0938174560.

It can be divided in two parts, 149 and 669, that multiplied together give a triangular number (99681 = T₄₄₆).

The spelling of 149669 in words is "one hundred forty-nine thousand, six hundred sixty-nine".