1604543 has 2 divisors, whose sum is σ = 1604544. Its totient is φ = 1604542.

The previous prime is 1604539. The next prime is 1604557. The reversal of 1604543 is 3454061.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1604543 - 2² = 1604539 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1604513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 802271 + 802272.

It is an arithmetic number, because the mean of its divisors is an integer number (802272).

2^1604543 is an apocalyptic number.

1604543 is a deficient number, since it is larger than the sum of its proper divisors (1).

1604543 is an equidigital number, since it uses as much as digits as its factorization.

1604543 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 1604543 is about 1266.7055695780. The cubic root of 1604543 is about 117.0713033602.

The spelling of 1604543 in words is "one million, six hundred four thousand, five hundred forty-three".