155798 has 4 divisors (see below), whose sum is σ = 233700. Its totient is φ = 77898.

The previous prime is 155797. The next prime is 155801. The reversal of 155798 is 897551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 897551 = 449 ⋅1999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155797) 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 as a sum of consecutive naturals, namely, 38948 + ... + 38951.

It is an arithmetic number, because the mean of its divisors is an integer number (58425).

2¹⁵⁵⁷⁹⁸ is an apocalyptic number.

155798 is a deficient number, since it is larger than the sum of its proper divisors (77902).

155798 is an equidigital number, since it uses as much as digits as its factorization.

155798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77901.

The product of its digits is 12600, while the sum is 35.

The square root of 155798 is about 394.7125536387. The cubic root of 155798 is about 53.8088808508.

The spelling of 155798 in words is "one hundred fifty-five thousand, seven hundred ninety-eight".