643412 has 24 divisors (see below), whose sum is σ = 1404480. Its totient is φ = 250560.

The previous prime is 643403. The next prime is 643421. The reversal of 643412 is 214346.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (643403) and next prime (643421).

It is a nialpdrome in base 15.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 737 + ... + 1352.

It is an arithmetic number, because the mean of its divisors is an integer number (58520).

2⁶⁴³⁴¹² is an apocalyptic number.

It is an amenable number.

643412 is an abundant number, since it is smaller than the sum of its proper divisors (761068).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

643412 is a wasteful number, since it uses less digits than its factorization.

643412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2111 (or 2109 counting only the distinct ones).

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

The square root of 643412 is about 802.1296653285. The cubic root of 643412 is about 86.3302606533.

Adding to 643412 its reverse (214346), we get a palindrome (857758).

It can be divided in two parts, 6434 and 12, that added together give a palindrome (6446).

The spelling of 643412 in words is "six hundred forty-three thousand, four hundred twelve".