149779 has 4 divisors (see below), whose sum is σ = 171184. Its totient is φ = 128376.

The previous prime is 149771. The next prime is 149791. The reversal of 149779 is 977941.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 977941 = 79 ⋅12379.

It is a cyclic number.

It is not a de Polignac number, because 149779 - 2³ = 149771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (149771) 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, 10692 + ... + 10705.

It is an arithmetic number, because the mean of its divisors is an integer number (42796).

2¹⁴⁹⁷⁷⁹ is an apocalyptic number.

149779 is a deficient number, since it is larger than the sum of its proper divisors (21405).

149779 is an equidigital number, since it uses as much as digits as its factorization.

149779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21404.

The product of its digits is 15876, while the sum is 37.

The square root of 149779 is about 387.0129196810. The cubic root of 149779 is about 53.1068214620.

Subtracting from 149779 its product of digits (15876), we obtain a triangular number (133903 = T₅₁₇).

The spelling of 149779 in words is "one hundred forty-nine thousand, seven hundred seventy-nine".