1604913 has 4 divisors (see below), whose sum is σ = 2139888. Its totient is φ = 1069940.

The previous prime is 1604857. The next prime is 1604923. The reversal of 1604913 is 3194061.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1604913 - 2¹⁷ = 1473841 is a prime.

It is a D-number.

1604913 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1604923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 267483 + ... + 267488.

It is an arithmetic number, because the mean of its divisors is an integer number (534972).

2^1604913 is an apocalyptic number.

It is an amenable number.

1604913 is a deficient number, since it is larger than the sum of its proper divisors (534975).

1604913 is an equidigital number, since it uses as much as digits as its factorization.

1604913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 534974.

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 1604913 is about 1266.8516093055. The cubic root of 1604913 is about 117.0803013643.

Adding to 1604913 its reverse (3194061), we get a palindrome (4798974).

The spelling of 1604913 in words is "one million, six hundred four thousand, nine hundred thirteen".