1604993 has 6 divisors (see below), whose sum is σ = 1738134. Its totient is φ = 1481376.

The previous prime is 1604983. The next prime is 1605001. The reversal of 1604993 is 3994061.

It can be written as a sum of positive squares in 3 ways, for example, as 123904 + 1481089 = 352^2 + 1217^2 .

It is not a de Polignac number, because 1604993 - 2⁶ = 1604929 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 (1604923) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4580 + ... + 4917.

It is an arithmetic number, because the mean of its divisors is an integer number (289689).

2^1604993 is an apocalyptic number.

1604993 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1604993 is a deficient number, since it is larger than the sum of its proper divisors (133141).

1604993 is an equidigital number, since it uses as much as digits as its factorization.

1604993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9523 (or 9510 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 1604993 is about 1266.8831832493. The cubic root of 1604993 is about 117.0822466968.

The spelling of 1604993 in words is "one million, six hundred four thousand, nine hundred ninety-three".