642954242 has 8 divisors (see below), whose sum is σ = 1102207296. Its totient is φ = 275551812.

The previous prime is 642954239. The next prime is 642954283. The reversal of 642954242 is 242459246.

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

It is a junction number, because it is equal to n+sod(n) for n = 642954196 and 642954205.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22962638 + ... + 22962665.

It is an arithmetic number, because the mean of its divisors is an integer number (137775912).

Almost surely, 2^642954242 is an apocalyptic number.

642954242 is a deficient number, since it is larger than the sum of its proper divisors (459253054).

642954242 is a wasteful number, since it uses less digits than its factorization.

642954242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45925312.

The product of its digits is 138240, while the sum is 38.

The square root of 642954242 is about 25356.5423904759. The cubic root of 642954242 is about 863.0978246155.

The spelling of 642954242 in words is "six hundred forty-two million, nine hundred fifty-four thousand, two hundred forty-two".