1640004 has 24 divisors (see below), whose sum is σ = 4028640. Its totient is φ = 517824.

The previous prime is 1639999. The next prime is 1640017. The reversal of 1640004 is 4000461.

It is a super-2 number, since 2×1640004² = 5379226240032, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3369 + ... + 3824.

It is an arithmetic number, because the mean of its divisors is an integer number (167860).

2^1640004 is an apocalyptic number.

It is an amenable number.

1640004 is an abundant number, since it is smaller than the sum of its proper divisors (2388636).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1640004 is a wasteful number, since it uses less digits than its factorization.

1640004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7219 (or 7217 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 1640004 is about 1280.6264092232. The cubic root of 1640004 is about 117.9274666752.

Adding to 1640004 its reverse (4000461), we get a palindrome (5640465).

The spelling of 1640004 in words is "one million, six hundred forty thousand, four".