640046 has 16 divisors (see below), whose sum is σ = 1071360. Its totient is φ = 284280.

The previous prime is 640043. The next prime is 640049.

640046 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (640043) and next prime (640049).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 725 + ... + 1343.

It is an arithmetic number, because the mean of its divisors is an integer number (66960).

2⁶⁴⁰⁰⁴⁶ is an apocalyptic number.

640046 is a deficient number, since it is larger than the sum of its proper divisors (431314).

640046 is a wasteful number, since it uses less digits than its factorization.

640046 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 679.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 640046 is about 800.0287494834. The cubic root of 640046 is about 86.1794522184.

It can be divided in two parts, 6400 and 46, that added together give a palindrome (6446).

The spelling of 640046 in words is "six hundred forty thousand, forty-six".