1604208385 has 8 divisors (see below), whose sum is σ = 2073130920. Its totient is φ = 1184646144.

The previous prime is 1604208299. The next prime is 1604208401. The reversal of 1604208385 is 5838024061.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 186158736 + 1418049649 = 13644^2 + 37657^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1604208385 - 2²¹ = 1602111233 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12340000 + ... + 12340129.

It is an arithmetic number, because the mean of its divisors is an integer number (259141365).

Almost surely, 2^1604208385 is an apocalyptic number.

It is an amenable number.

1604208385 is a deficient number, since it is larger than the sum of its proper divisors (468922535).

1604208385 is a wasteful number, since it uses less digits than its factorization.

1604208385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24680147.

The product of its (nonzero) digits is 46080, while the sum is 37.

The square root of 1604208385 is about 40052.5702670877. The cubic root of 1604208385 is about 1170.6316469028.

The spelling of 1604208385 in words is "one billion, six hundred four million, two hundred eight thousand, three hundred eighty-five".