1604594 has 4 divisors (see below), whose sum is σ = 2406894. Its totient is φ = 802296.

The previous prime is 1604593. The next prime is 1604597. The reversal of 1604594 is 4954061.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4954061 = 7 ⋅707723.

It can be written as a sum of positive squares in only one way, i.e., 1471369 + 133225 = 1213^2 + 365^2 .

It is not an unprimeable number, because it can be changed into a prime (1604593) 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 as a sum of consecutive naturals, namely, 401147 + ... + 401150.

2^1604594 is an apocalyptic number.

1604594 is a deficient number, since it is larger than the sum of its proper divisors (802300).

1604594 is an equidigital number, since it uses as much as digits as its factorization.

1604594 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 802299.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 1604594 is about 1266.7257003787. The cubic root of 1604594 is about 117.0725437078.

The spelling of 1604594 in words is "one million, six hundred four thousand, five hundred ninety-four".