1604406 has 8 divisors (see below), whose sum is σ = 3208824. Its totient is φ = 534800.

The previous prime is 1604399. The next prime is 1604413. The reversal of 1604406 is 6044061.

It is an interprime number because it is at equal distance from previous prime (1604399) and next prime (1604413).

It is a sphenic number, since it is the product of 3 distinct primes.

1604406 is an admirable number.

It is a super-2 number, since 2×1604406² = 5148237225672, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133695 + ... + 133706.

It is an arithmetic number, because the mean of its divisors is an integer number (401103).

2^1604406 is an apocalyptic number.

1604406 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1604406 is a wasteful number, since it uses less digits than its factorization.

1604406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267406.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 1604406 is about 1266.6514911372. The cubic root of 1604406 is about 117.0679713159.

Adding to 1604406 its reverse (6044061), we get a palindrome (7648467).

The spelling of 1604406 in words is "one million, six hundred four thousand, four hundred six".