642442 has 4 divisors (see below), whose sum is σ = 963666. Its totient is φ = 321220.

The previous prime is 642427. The next prime is 642457. The reversal of 642442 is 244246.

642442 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is an interprime number because it is at equal distance from previous prime (642427) and next prime (642457).

It can be written as a sum of positive squares in only one way, i.e., 641601 + 841 = 801^2 + 29^2 .

It is an unprimeable number.

642442 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160609 + ... + 160612.

2⁶⁴²⁴⁴² is an apocalyptic number.

642442 is a deficient number, since it is larger than the sum of its proper divisors (321224).

642442 is a wasteful number, since it uses less digits than its factorization.

642442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321223.

The product of its digits is 1536, while the sum is 22.

The square root of 642442 is about 801.5247968716. The cubic root of 642442 is about 86.2868553547.

Adding to 642442 its reverse (244246), we get a palindrome (886688).

It can be divided in two parts, 64244 and 2, that added together give a palindrome (64246).

The spelling of 642442 in words is "six hundred forty-two thousand, four hundred forty-two".