1604402001 has 12 divisors (see below), whose sum is σ = 2318048512. Its totient is φ = 1069334136.

The previous prime is 1604401999. The next prime is 1604402017. The reversal of 1604402001 is 1002044061.

1604402001 is a `hidden beast` number, since 1 + 604 + 40 + 20 + 0 + 1 = 666.

It is not a de Polignac number, because 1604402001 - 2¹ = 1604401999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1604402071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19980 + ... + 60066.

Almost surely, 2^1604402001 is an apocalyptic number.

It is an amenable number.

1604402001 is a deficient number, since it is larger than the sum of its proper divisors (713646511).

1604402001 is a wasteful number, since it uses less digits than its factorization.

1604402001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44540 (or 44537 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 1604402001 is about 40054.9872175738. The cubic root of 1604402001 is about 1170.6787405143.

Adding to 1604402001 its reverse (1002044061), we get a palindrome (2606446062).

The spelling of 1604402001 in words is "one billion, six hundred four million, four hundred two thousand, one".