155779 has 8 divisors (see below), whose sum is σ = 175392. Its totient is φ = 137280.

The previous prime is 155777. The next prime is 155783. The reversal of 155779 is 977551.

It is a happy number.

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

It is not a de Polignac number, because 155779 - 2¹ = 155777 is a prime.

It is a Duffinian number.

155779 is a lucky number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (155773) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39 + ... + 559.

It is an arithmetic number, because the mean of its divisors is an integer number (21924).

2¹⁵⁵⁷⁷⁹ is an apocalyptic number.

155779 is a deficient number, since it is larger than the sum of its proper divisors (19613).

155779 is a wasteful number, since it uses less digits than its factorization.

155779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 557.

The product of its digits is 11025, while the sum is 34.

The square root of 155779 is about 394.6884847573. The cubic root of 155779 is about 53.8066933810.

The spelling of 155779 in words is "one hundred fifty-five thousand, seven hundred seventy-nine".