1623404 has 12 divisors (see below), whose sum is σ = 2868264. Its totient is φ = 803904.

The previous prime is 1623403. The next prime is 1623421. The reversal of 1623404 is 4043261.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1623403) 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, 1469 + ... + 2324.

It is an arithmetic number, because the mean of its divisors is an integer number (239022).

2^1623404 is an apocalyptic number.

It is an amenable number.

1623404 is a deficient number, since it is larger than the sum of its proper divisors (1244860).

1623404 is a wasteful number, since it uses less digits than its factorization.

1623404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3904 (or 3902 counting only the distinct ones).

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

The square root of 1623404 is about 1274.1287219116. The cubic root of 1623404 is about 117.5282322382.

Adding to 1623404 its reverse (4043261), we get a palindrome (5666665).

The spelling of 1623404 in words is "one million, six hundred twenty-three thousand, four hundred four".