642446 has 16 divisors (see below), whose sum is σ = 1114080. Its totient is φ = 272160.

The previous prime is 642427. The next prime is 642457. The reversal of 642446 is 644246.

It is a Smith number, since the sum of its digits (26) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

642446 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1316 + ... + 1736.

It is an arithmetic number, because the mean of its divisors is an integer number (69630).

2⁶⁴²⁴⁴⁶ is an apocalyptic number.

642446 is a deficient number, since it is larger than the sum of its proper divisors (471634).

642446 is a wasteful number, since it uses less digits than its factorization.

642446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 539.

The product of its digits is 4608, while the sum is 26.

The square root of 642446 is about 801.5272921118. The cubic root of 642446 is about 86.2870344353.

The spelling of 642446 in words is "six hundred forty-two thousand, four hundred forty-six".