642244 has 12 divisors (see below), whose sum is σ = 1129744. Its totient is φ = 319464.

The previous prime is 642241. The next prime is 642247. The reversal of 642244 is 442246.

It is an interprime number because it is at equal distance from previous prime (642241) and next prime (642247).

It is a super-3 number, since 3×642244³ = 794733320186588352, which contains 333 as substring.

It is a hoax number, since the sum of its digits (22) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (642241) 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, 967 + ... + 1489.

2⁶⁴²²⁴⁴ is an apocalyptic number.

It is an amenable number.

642244 is a deficient number, since it is larger than the sum of its proper divisors (487500).

642244 is a wasteful number, since it uses less digits than its factorization.

642244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 834 (or 832 counting only the distinct ones).

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

The square root of 642244 is about 801.4012727716. The cubic root of 642244 is about 86.2779899355.

The spelling of 642244 in words is "six hundred forty-two thousand, two hundred forty-four".