123455 has 4 divisors (see below), whose sum is σ = 148152. Its totient is φ = 98760.

The previous prime is 123449. The next prime is 123457. The reversal of 123455 is 554321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 554321 = 151 ⋅3671.

It is not a de Polignac number, because 123455 - 2⁴ = 123439 is a prime.

It is a super-2 number, since 2×123455² = 30482274050, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12341 + ... + 12350.

It is an arithmetic number, because the mean of its divisors is an integer number (37038).

2¹²³⁴⁵⁵ is an apocalyptic number.

123455 is a deficient number, since it is larger than the sum of its proper divisors (24697).

123455 is an equidigital number, since it uses as much as digits as its factorization.

123455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24696.

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

The square root of 123455 is about 351.3616370636. The cubic root of 123455 is about 49.7931454037.

Adding to 123455 its reverse (554321), we get a palindrome (677776).

The spelling of 123455 in words is "one hundred twenty-three thousand, four hundred fifty-five".