1604791 has 4 divisors (see below), whose sum is σ = 1610784. Its totient is φ = 1598800.

The previous prime is 1604753. The next prime is 1604809. The reversal of 1604791 is 1974061.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1974061 = 37 ⋅53353.

It is a cyclic number.

It is not a de Polignac number, because 1604791 - 2⁹ = 1604279 is a prime.

It is a Duffinian number.

1604791 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1604711) 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 3 ways as a sum of consecutive naturals, for example, 2575 + ... + 3136.

It is an arithmetic number, because the mean of its divisors is an integer number (402696).

2^1604791 is an apocalyptic number.

1604791 is a deficient number, since it is larger than the sum of its proper divisors (5993).

1604791 is an equidigital number, since it uses as much as digits as its factorization.

1604791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5992.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 1604791 is about 1266.8034575261. The cubic root of 1604791 is about 117.0773346076.

The spelling of 1604791 in words is "one million, six hundred four thousand, seven hundred ninety-one".