1000642 has 4 divisors (see below), whose sum is σ = 1500966. Its totient is φ = 500320.

The previous prime is 1000639. The next prime is 1000651. The reversal of 1000642 is 2460001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2460001 = 367 ⋅6703.

It can be written as a sum of positive squares in only one way, i.e., 720801 + 279841 = 849^2 + 529^2 .

It is a Smith number, since the sum of its digits (13) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 250159 + ... + 250162.

2^1000642 is an apocalyptic number.

1000642 is a deficient number, since it is larger than the sum of its proper divisors (500324).

1000642 is an equidigital number, since it uses as much as digits as its factorization.

1000642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 500323.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 1000642 is about 1000.3209484960. The cubic root of 1000642 is about 100.0213954220.

Adding to 1000642 its reverse (2460001), we get a palindrome (3460643).

The spelling of 1000642 in words is "one million, six hundred forty-two", and thus it is an aban number.