642943683 has 8 divisors (see below), whose sum is σ = 952509200. Its totient is φ = 428629104.

The previous prime is 642943681. The next prime is 642943711. The reversal of 642943683 is 386349246.

It is not a de Polignac number, because 642943683 - 2¹ = 642943681 is a prime.

It is a super-3 number, since 3×642943683³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642943681) 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 7 ways as a sum of consecutive naturals, for example, 11906338 + ... + 11906391.

It is an arithmetic number, because the mean of its divisors is an integer number (119063650).

Almost surely, 2^642943683 is an apocalyptic number.

642943683 is a deficient number, since it is larger than the sum of its proper divisors (309565517).

642943683 is a wasteful number, since it uses less digits than its factorization.

642943683 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23812738 (or 23812732 counting only the distinct ones).

The product of its digits is 746496, while the sum is 45.

The square root of 642943683 is about 25356.3341790567. The cubic root of 642943683 is about 863.0930998107.

The spelling of 642943683 in words is "six hundred forty-two million, nine hundred forty-three thousand, six hundred eighty-three".