642042293 has 4 divisors (see below), whose sum is σ = 642324588. Its totient is φ = 641760000.

The previous prime is 642042229. The next prime is 642042299. The reversal of 642042293 is 392240246.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 154206724 + 487835569 = 12418^2 + 22087^2 .

It is a cyclic number.

It is not a de Polignac number, because 642042293 - 2⁶ = 642042229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642042299) 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, 137708 + ... + 142293.

It is an arithmetic number, because the mean of its divisors is an integer number (160581147).

Almost surely, 2^642042293 is an apocalyptic number.

It is an amenable number.

642042293 is a deficient number, since it is larger than the sum of its proper divisors (282295).

642042293 is a wasteful number, since it uses less digits than its factorization.

642042293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282294.

The product of its (nonzero) digits is 20736, while the sum is 32.

The square root of 642042293 is about 25338.5534906790. The cubic root of 642042293 is about 862.6895666222.

The spelling of 642042293 in words is "six hundred forty-two million, forty-two thousand, two hundred ninety-three".