123404420 has 12 divisors (see below), whose sum is σ = 259149324. Its totient is φ = 49361760.

The previous prime is 123404389. The next prime is 123404429. The reversal of 123404420 is 24404321.

It can be written as a sum of positive squares in 2 ways, for example, as 57729604 + 65674816 = 7598^2 + 8104^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 6170221 = 123404420 / (1 + 2 + 3 + 4 + 0 + 4 + 4 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 123404392 and 123404401.

It is not an unprimeable number, because it can be changed into a prime (123404429) 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, 3085091 + ... + 3085130.

It is an arithmetic number, because the mean of its divisors is an integer number (21595777).

Almost surely, 2^123404420 is an apocalyptic number.

123404420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123404420 is an abundant number, since it is smaller than the sum of its proper divisors (135744904).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123404420 is a wasteful number, since it uses less digits than its factorization.

123404420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6170230 (or 6170228 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 123404420 is about 11108.7542055804. The cubic root of 123404420 is about 497.8634432547.

Adding to 123404420 its reverse (24404321), we get a palindrome (147808741).

Subtracting from 123404420 its reverse (24404321), we obtain a palindrome (99000099).

The spelling of 123404420 in words is "one hundred twenty-three million, four hundred four thousand, four hundred twenty".