640230 has 16 divisors (see below), whose sum is σ = 1536624.
Its totient is φ = 170720.
The previous prime is 640229. The next prime is 640231. The reversal of 640230 is 32046.
640230 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is an interprime number because it is at equal distance from previous prime (640229) and next prime (640231).
It is a Harshad number since it is a multiple of its sum of digits (15).
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (640231) 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, 10641 + ... + 10700.
It is an arithmetic number, because the mean of its divisors is an integer number (96039).
2640230 is an apocalyptic number.
640230 is an abundant number, since it is smaller than the sum of its proper divisors (896394).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
640230 is a wasteful number, since it uses less digits than its factorization.
640230 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 21351.
The product of its (nonzero) digits is 144, while the sum is 15.
The square root of 640230 is about 800.1437370873.
The cubic root of 640230 is about 86.1877096978.
Adding to 640230 its reverse (32046), we get a palindrome (672276).
The spelling of 640230 in words is "six hundred forty thousand, two hundred thirty".