642731973 has 16 divisors (see below), whose sum is σ = 935899776. Its totient is φ = 389954880.

The previous prime is 642731963. The next prime is 642731977. The reversal of 642731973 is 379137246.

It is not a de Polignac number, because 642731973 - 2¹⁸ = 642469829 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642731977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 113290 + ... + 118827.

It is an arithmetic number, because the mean of its divisors is an integer number (58493736).

Almost surely, 2^642731973 is an apocalyptic number.

It is an amenable number.

642731973 is a deficient number, since it is larger than the sum of its proper divisors (293167803).

642731973 is a wasteful number, since it uses less digits than its factorization.

642731973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232204.

The product of its digits is 190512, while the sum is 42.

The square root of 642731973 is about 25352.1591388189. The cubic root of 642731973 is about 862.9983556391.

The spelling of 642731973 in words is "six hundred forty-two million, seven hundred thirty-one thousand, nine hundred seventy-three".