123404213 has 4 divisors (see below), whose sum is σ = 126739500. Its totient is φ = 120068928.

The previous prime is 123404201. The next prime is 123404231. The reversal of 123404213 is 312404321.

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

It can be written as a sum of positive squares in 2 ways, for example, as 118417924 + 4986289 = 10882^2 + 2233^2 .

It is a cyclic number.

It is not a de Polignac number, because 123404213 - 2¹⁴ = 123387829 is a prime.

It is a super-2 number, since 2×123404213² = 30457199572298738, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123404263) 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, 1667588 + ... + 1667661.

It is an arithmetic number, because the mean of its divisors is an integer number (31684875).

Almost surely, 2^123404213 is an apocalyptic number.

It is an amenable number.

123404213 is a deficient number, since it is larger than the sum of its proper divisors (3335287).

123404213 is an equidigital number, since it uses as much as digits as its factorization.

123404213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3335286.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 123404213 is about 11108.7448886002. The cubic root of 123404213 is about 497.8631648806.

Adding to 123404213 its reverse (312404321), we get a palindrome (435808534).

The spelling of 123404213 in words is "one hundred twenty-three million, four hundred four thousand, two hundred thirteen".