404392 has 8 divisors (see below), whose sum is σ = 758250. Its totient is φ = 202192.

The previous prime is 404389. The next prime is 404399. The reversal of 404392 is 293404.

It can be written as a sum of positive squares in only one way, i.e., 298116 + 106276 = 546^2 + 326^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a nialpdrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (404399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25267 + ... + 25282.

2⁴⁰⁴³⁹² is an apocalyptic number.

It is an amenable number.

404392 is a deficient number, since it is larger than the sum of its proper divisors (353858).

404392 is a wasteful number, since it uses less digits than its factorization.

404392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50555 (or 50551 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 404392 is about 635.9182337376. The cubic root of 404392 is about 73.9493200592.

Adding to 404392 its reverse (293404), we get a palindrome (697796).

The spelling of 404392 in words is "four hundred four thousand, three hundred ninety-two".