1604407 has 12 divisors (see below), whose sum is σ = 1887840. Its totient is φ = 1359456.

The previous prime is 1604399. The next prime is 1604413. The reversal of 1604407 is 7044061.

It is not a de Polignac number, because 1604407 - 2³ = 1604399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1604437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6594 + ... + 6832.

It is an arithmetic number, because the mean of its divisors is an integer number (157320).

2^1604407 is an apocalyptic number.

1604407 is a deficient number, since it is larger than the sum of its proper divisors (283433).

1604407 is a wasteful number, since it uses less digits than its factorization.

1604407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390 (or 383 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 1604407 is about 1266.6518858787. The cubic root of 1604407 is about 117.0679956381.

Adding to 1604407 its reverse (7044061), we get a palindrome (8648468).

The spelling of 1604407 in words is "one million, six hundred four thousand, four hundred seven".