155818 has 12 divisors (see below), whose sum is σ = 253638. Its totient is φ = 71760.

The previous prime is 155809. The next prime is 155821. The reversal of 155818 is 818551.

It can be written as a sum of positive squares in 3 ways, for example, as 64009 + 91809 = 253^2 + 303^2 .

It is an unprimeable number.

155818 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 5 ways as a sum of consecutive naturals, for example, 108 + ... + 568.

2¹⁵⁵⁸¹⁸ is an apocalyptic number.

155818 is a deficient number, since it is larger than the sum of its proper divisors (97820).

155818 is a wasteful number, since it uses less digits than its factorization.

155818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489 (or 476 counting only the distinct ones).

The product of its digits is 1600, while the sum is 28.

The square root of 155818 is about 394.7378877179. The cubic root of 155818 is about 53.8111832586.

The spelling of 155818 in words is "one hundred fifty-five thousand, eight hundred eighteen".