643254339 has 32 divisors (see below), whose sum is σ = 1058552320. Its totient is φ = 338349312.

The previous prime is 643254301. The next prime is 643254383. The reversal of 643254339 is 933452346.

It is not a de Polignac number, because 643254339 - 2⁸ = 643254083 is a prime.

It is a super-2 number, since 2×643254339² = 827552289284653842, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a junction number, because it is equal to n+sod(n) for n = 643254297 and 643254306.

It is not an unprimeable number, because it can be changed into a prime (643254439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 100359 + ... + 106575.

It is an arithmetic number, because the mean of its divisors is an integer number (33079760).

Almost surely, 2^643254339 is an apocalyptic number.

643254339 is a deficient number, since it is larger than the sum of its proper divisors (415297981).

643254339 is a wasteful number, since it uses less digits than its factorization.

643254339 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6619.

The product of its digits is 233280, while the sum is 39.

The square root of 643254339 is about 25362.4592459012. The cubic root of 643254339 is about 863.2320865186.

The spelling of 643254339 in words is "six hundred forty-three million, two hundred fifty-four thousand, three hundred thirty-nine".