640412 has 12 divisors (see below), whose sum is σ = 1169616. Its totient is φ = 306240.

The previous prime is 640411. The next prime is 640421. The reversal of 640412 is 214046.

640412 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3389 + ... + 3572.

It is an arithmetic number, because the mean of its divisors is an integer number (97468).

2⁶⁴⁰⁴¹² is an apocalyptic number.

It is an amenable number.

640412 is a deficient number, since it is larger than the sum of its proper divisors (529204).

640412 is a wasteful number, since it uses less digits than its factorization.

640412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6988 (or 6986 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 640412 is about 800.2574585719. The cubic root of 640412 is about 86.1958758657.

Adding to 640412 its reverse (214046), we get a palindrome (854458).

The spelling of 640412 in words is "six hundred forty thousand, four hundred twelve".