642842337 has 4 divisors (see below), whose sum is σ = 857123120. Its totient is φ = 428561556.

The previous prime is 642842327. The next prime is 642842351. The reversal of 642842337 is 733248246.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 642842337 - 2⁷ = 642842209 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 642842295 and 642842304.

It is not an unprimeable number, because it can be changed into a prime (642842327) 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, 107140387 + ... + 107140392.

It is an arithmetic number, because the mean of its divisors is an integer number (214280780).

Almost surely, 2^642842337 is an apocalyptic number.

It is an amenable number.

642842337 is a deficient number, since it is larger than the sum of its proper divisors (214280783).

642842337 is a wasteful number, since it uses less digits than its factorization.

642842337 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214280782.

The product of its digits is 193536, while the sum is 39.

The square root of 642842337 is about 25354.3356647340. The cubic root of 642842337 is about 863.0477481820.

The spelling of 642842337 in words is "six hundred forty-two million, eight hundred forty-two thousand, three hundred thirty-seven".