1604663 has 4 divisors (see below), whose sum is σ = 1611960. Its totient is φ = 1597368.

The previous prime is 1604651. The next prime is 1604711. The reversal of 1604663 is 3664061.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1604663 - 2¹⁶ = 1539127 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1604263) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3308 + ... + 3761.

It is an arithmetic number, because the mean of its divisors is an integer number (402990).

2^1604663 is an apocalyptic number.

1604663 is a deficient number, since it is larger than the sum of its proper divisors (7297).

1604663 is an equidigital number, since it uses as much as digits as its factorization.

1604663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7296.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 1604663 is about 1266.7529356587. The cubic root of 1604663 is about 117.0742217833.

The spelling of 1604663 in words is "one million, six hundred four thousand, six hundred sixty-three".