1604485397 has 4 divisors (see below), whose sum is σ = 1608191340. Its totient is φ = 1600779456.

The previous prime is 1604485391. The next prime is 1604485417. The reversal of 1604485397 is 7935844061.

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

It can be written as a sum of positive squares in 2 ways, for example, as 833534641 + 770950756 = 28871^2 + 27766^2 .

It is a cyclic number.

It is not a de Polignac number, because 1604485397 - 2¹⁰ = 1604484373 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 (1604485391) 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, 1852322 + ... + 1853187.

It is an arithmetic number, because the mean of its divisors is an integer number (402047835).

Almost surely, 2^1604485397 is an apocalyptic number.

It is an amenable number.

1604485397 is a deficient number, since it is larger than the sum of its proper divisors (3705943).

1604485397 is an equidigital number, since it uses as much as digits as its factorization.

1604485397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3705942.

The product of its (nonzero) digits is 725760, while the sum is 47.

The square root of 1604485397 is about 40056.0282229779. The cubic root of 1604485397 is about 1170.6990239247.

The spelling of 1604485397 in words is "one billion, six hundred four million, four hundred eighty-five thousand, three hundred ninety-seven".