1640001 has 8 divisors (see below), whose sum is σ = 2385504. Its totient is φ = 993920.

The previous prime is 1639999. The next prime is 1640017. The reversal of 1640001 is 1000461.

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 1640001 - 2¹ = 1639999 is a prime.

It is a Curzon number.

1640001 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1640021) by changing a digit.

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, 24816 + ... + 24881.

It is an arithmetic number, because the mean of its divisors is an integer number (298188).

2^1640001 is an apocalyptic number.

1640001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1640001 is a deficient number, since it is larger than the sum of its proper divisors (745503).

1640001 is a wasteful number, since it uses less digits than its factorization.

1640001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49711.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 1640001 is about 1280.6252379209. The cubic root of 1640001 is about 117.9273947684.

Adding to 1640001 its reverse (1000461), we get a palindrome (2640462).

The spelling of 1640001 in words is "one million, six hundred forty thousand, one".