642245938 has 8 divisors (see below), whose sum is σ = 963608688. Its totient is φ = 321043044.

The previous prime is 642245927. The next prime is 642245939. The reversal of 642245938 is 839542246.

642245938 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a super-3 number, since 3×642245938³ (a number of 27 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 642245894 and 642245903.

It is not an unprimeable number, because it can be changed into a prime (642245939) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29356 + ... + 46327.

It is an arithmetic number, because the mean of its divisors is an integer number (120451086).

Almost surely, 2^642245938 is an apocalyptic number.

642245938 is a deficient number, since it is larger than the sum of its proper divisors (321362750).

642245938 is a wasteful number, since it uses less digits than its factorization.

642245938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79928.

The product of its digits is 414720, while the sum is 43.

The square root of 642245938 is about 25342.5716532478. The cubic root of 642245938 is about 862.7807671799.

The spelling of 642245938 in words is "six hundred forty-two million, two hundred forty-five thousand, nine hundred thirty-eight".