643223929 has 8 divisors (see below), whose sum is σ = 698919680. Its totient is φ = 589712400.

The previous prime is 643223927. The next prime is 643223963. The reversal of 643223929 is 929322346.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 643223929 - 2¹ = 643223927 is a prime.

It is a Duffinian number.

It is a zygodrome in base 3.

It is a junction number, because it is equal to n+sod(n) for n = 643223891 and 643223900.

It is not an unprimeable number, because it can be changed into a prime (643223927) 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, 545442 + ... + 546619.

It is an arithmetic number, because the mean of its divisors is an integer number (87364960).

Almost surely, 2^643223929 is an apocalyptic number.

It is an amenable number.

643223929 is a deficient number, since it is larger than the sum of its proper divisors (55695751).

643223929 is a wasteful number, since it uses less digits than its factorization.

643223929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1092111.

The product of its digits is 139968, while the sum is 40.

The square root of 643223929 is about 25361.8597307059. The cubic root of 643223929 is about 863.2184831377.

The spelling of 643223929 in words is "six hundred forty-three million, two hundred twenty-three thousand, nine hundred twenty-nine".