1640007 has 24 divisors (see below), whose sum is σ = 2607696. Its totient is φ = 1026432.

The previous prime is 1639999. The next prime is 1640017. The reversal of 1640007 is 7000461.

It is not a de Polignac number, because 1640007 - 2³ = 1639999 is a prime.

1640007 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640017) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3933 + ... + 4329.

It is an arithmetic number, because the mean of its divisors is an integer number (108654).

2^1640007 is an apocalyptic number.

1640007 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

1640007 is a deficient number, since it is larger than the sum of its proper divisors (967689).

1640007 is an equidigital number, since it uses as much as digits as its factorization.

1640007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 429 (or 417 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 1640007 is about 1280.6275805245. The cubic root of 1640007 is about 117.9275385820.

Adding to 1640007 its reverse (7000461), we get a palindrome (8640468).

The spelling of 1640007 in words is "one million, six hundred forty thousand, seven".