1604329 has 2 divisors, whose sum is σ = 1604330. Its totient is φ = 1604328.

The previous prime is 1604311. The next prime is 1604333. The reversal of 1604329 is 9234061.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1081600 + 522729 = 1040^2 + 723^2 .

It is a cyclic number.

It is not a de Polignac number, because 1604329 - 2⁵ = 1604297 is a prime.

It is an Ulam number.

1604329 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1604359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 802164 + 802165.

It is an arithmetic number, because the mean of its divisors is an integer number (802165).

2^1604329 is an apocalyptic number.

It is an amenable number.

1604329 is a deficient number, since it is larger than the sum of its proper divisors (1).

1604329 is an equidigital number, since it uses as much as digits as its factorization.

1604329 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 1604329 is about 1266.6210956715. The cubic root of 1604329 is about 117.0660984778.

It can be divided in two parts, 160 and 4329, that added together give a square (4489 = 67²).

The spelling of 1604329 in words is "one million, six hundred four thousand, three hundred twenty-nine".