642227039 has 4 divisors (see below), whose sum is σ = 643904256. Its totient is φ = 640549824.

The previous prime is 642227017. The next prime is 642227083. The reversal of 642227039 is 930722246.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 642227039 - 2¹⁶ = 642161503 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 (642227099) 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, 838034 + ... + 838799.

It is an arithmetic number, because the mean of its divisors is an integer number (160976064).

Almost surely, 2^642227039 is an apocalyptic number.

642227039 is a deficient number, since it is larger than the sum of its proper divisors (1677217).

642227039 is a wasteful number, since it uses less digits than its factorization.

642227039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1677216.

The product of its (nonzero) digits is 36288, while the sum is 35.

The square root of 642227039 is about 25342.1987799007. The cubic root of 642227039 is about 862.7723042465.

The spelling of 642227039 in words is "six hundred forty-two million, two hundred twenty-seven thousand, thirty-nine".