1604539 has 2 divisors, whose sum is σ = 1604540. Its totient is φ = 1604538.

The previous prime is 1604521. The next prime is 1604543. The reversal of 1604539 is 9354061.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1604539 - 2¹³ = 1596347 is a prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (1604509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 802269 + 802270.

It is an arithmetic number, because the mean of its divisors is an integer number (802270).

2^1604539 is an apocalyptic number.

1604539 is a deficient number, since it is larger than the sum of its proper divisors (1).

1604539 is an equidigital number, since it uses as much as digits as its factorization.

1604539 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 1604539 is about 1266.7039906782. The cubic root of 1604539 is about 117.0712060769.

The spelling of 1604539 in words is "one million, six hundred four thousand, five hundred thirty-nine".