1009645 has 24 divisors (see below), whose sum is σ = 1522584. Its totient is φ = 637056.

The previous prime is 1009643. The next prime is 1009649. The reversal of 1009645 is 5469001.

It can be written as a sum of positive squares in 4 ways, for example, as 21609 + 988036 = 147^2 + 994^2 .

It is not a de Polignac number, because 1009645 - 2¹ = 1009643 is a prime.

It is a super-3 number, since 3×1009645³ = 3087644925933033375, which contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1009643) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3027 + ... + 3343.

It is an arithmetic number, because the mean of its divisors is an integer number (63441).

2^1009645 is an apocalyptic number.

It is an amenable number.

1009645 is a deficient number, since it is larger than the sum of its proper divisors (512939).

1009645 is a wasteful number, since it uses less digits than its factorization.

1009645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349 (or 342 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 1009645 is about 1004.8109274884. The cubic root of 1009645 is about 100.3204718806.

The spelling of 1009645 in words is "one million, nine thousand, six hundred forty-five".