155442823 has 4 divisors (see below), whose sum is σ = 157991128. Its totient is φ = 152894520.

The previous prime is 155442821. The next prime is 155442827. The reversal of 155442823 is 328244551.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 155442823 - 2¹ = 155442821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155442821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1274061 + ... + 1274182.

It is an arithmetic number, because the mean of its divisors is an integer number (39497782).

Almost surely, 2^155442823 is an apocalyptic number.

155442823 is a deficient number, since it is larger than the sum of its proper divisors (2548305).

155442823 is an equidigital number, since it uses as much as digits as its factorization.

155442823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2548304.

The product of its digits is 38400, while the sum is 34.

The square root of 155442823 is about 12467.6711137245. The cubic root of 155442823 is about 537.6795987532.

The spelling of 155442823 in words is "one hundred fifty-five million, four hundred forty-two thousand, eight hundred twenty-three".