404123400 has 72 divisors (see below), whose sum is σ = 1357187130. Its totient is φ = 107765760.

The previous prime is 404123393. The next prime is 404123449. The reversal of 404123400 is 4321404.

It can be written as a sum of positive squares in 3 ways, for example, as 388011204 + 16112196 = 19698^2 + 4014^2 .

It is a tau number, because it is divible by the number of its divisors (72).

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 17 ways as a sum of consecutive naturals, for example, 110457 + ... + 114056.

Almost surely, 2^404123400 is an apocalyptic number.

404123400 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

404123400 is an abundant number, since it is smaller than the sum of its proper divisors (953063730).

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

404123400 is a wasteful number, since it uses less digits than its factorization.

404123400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224535 (or 224523 counting only the distinct ones).

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

The square root of 404123400 is about 20102.8206976036. The cubic root of 404123400 is about 739.3294388078.

Adding to 404123400 its reverse (4321404), we get a palindrome (408444804).

The spelling of 404123400 in words is "four hundred four million, one hundred twenty-three thousand, four hundred".