123400404 has 18 divisors (see below), whose sum is σ = 311928890. Its totient is φ = 41133456.

The previous prime is 123400397. The next prime is 123400463. The reversal of 123400404 is 404004321.

It can be written as a sum of positive squares in only one way, i.e., 65610000 + 57790404 = 8100^2 + 7602^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1713859 + ... + 1713930.

Almost surely, 2^123400404 is an apocalyptic number.

It is an amenable number.

123400404 is an abundant number, since it is smaller than the sum of its proper divisors (188528486).

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

123400404 is a wasteful number, since it uses less digits than its factorization.

123400404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3427799 (or 3427794 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 123400404 is about 11108.5734457670. The cubic root of 123400404 is about 497.8580424722.

Adding to 123400404 its reverse (404004321), we get a palindrome (527404725).

The spelling of 123400404 in words is "one hundred twenty-three million, four hundred thousand, four hundred four".