643924041 has 8 divisors (see below), whose sum is σ = 903753120. Its totient is φ = 406688832.

The previous prime is 643924027. The next prime is 643924051. The reversal of 643924041 is 140429346.

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

It is not a de Polignac number, because 643924041 - 2¹⁵ = 643891273 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 643923993 and 643924011.

It is not an unprimeable number, because it can be changed into a prime (643924051) 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, 5648400 + ... + 5648513.

It is an arithmetic number, because the mean of its divisors is an integer number (112969140).

Almost surely, 2^643924041 is an apocalyptic number.

It is an amenable number.

643924041 is a deficient number, since it is larger than the sum of its proper divisors (259829079).

643924041 is a wasteful number, since it uses less digits than its factorization.

643924041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11296935.

The product of its (nonzero) digits is 20736, while the sum is 33.

The square root of 643924041 is about 25375.6584348072. The cubic root of 643924041 is about 863.5315573552.

The spelling of 643924041 in words is "six hundred forty-three million, nine hundred twenty-four thousand, forty-one".