155423 has 2 divisors, whose sum is σ = 155424. Its totient is φ = 155422.

The previous prime is 155413. The next prime is 155443. The reversal of 155423 is 324551.

It is an a-pointer prime, because the next prime (155443) can be obtained adding 155423 to its sum of digits (20).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 155423 - 2⁸ = 155167 is a prime.

It is a super-3 number, since 3×155423³ = 11263338008015901, which contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 155395 and 155404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77711 + 77712.

It is an arithmetic number, because the mean of its divisors is an integer number (77712).

2¹⁵⁵⁴²³ is an apocalyptic number.

155423 is a deficient number, since it is larger than the sum of its proper divisors (1).

155423 is an equidigital number, since it uses as much as digits as its factorization.

155423 is an evil number, because the sum of its binary digits is even.

The product of its digits is 600, while the sum is 20.

The square root of 155423 is about 394.2372382208. The cubic root of 155423 is about 53.7656741740.

Subtracting from 155423 its sum of digits (20), we obtain a triangular number (155403 = T₅₅₇).

Adding to 155423 its reverse (324551), we get a palindrome (479974).

The spelling of 155423 in words is "one hundred fifty-five thousand, four hundred twenty-three".