1006538 has 8 divisors (see below), whose sum is σ = 1625988. Its totient is φ = 464544.

The previous prime is 1006531. The next prime is 1006543. The reversal of 1006538 is 8356001.

It can be written as a sum of positive squares in 2 ways, for example, as 1006009 + 529 = 1003^2 + 23^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1006531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19331 + ... + 19382.

2^1006538 is an apocalyptic number.

1006538 is a deficient number, since it is larger than the sum of its proper divisors (619450).

1006538 is a wasteful number, since it uses less digits than its factorization.

1006538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38728.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 1006538 is about 1003.2636742153. The cubic root of 1006538 is about 100.2174601016.

The spelling of 1006538 in words is "one million, six thousand, five hundred thirty-eight".