1009640 has 32 divisors (see below), whose sum is σ = 2328480. Its totient is φ = 393792.

The previous prime is 1009637. The next prime is 1009643. The reversal of 1009640 is 469001.

It is an interprime number because it is at equal distance from previous prime (1009637) and next prime (1009643).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (1009643) 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 7 ways as a sum of consecutive naturals, for example, 1427 + ... + 2013.

It is an arithmetic number, because the mean of its divisors is an integer number (72765).

2^1009640 is an apocalyptic number.

1009640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1009640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1164240).

1009640 is an abundant number, since it is smaller than the sum of its proper divisors (1318840).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1009640 is a wasteful number, since it uses less digits than its factorization.

1009640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 641 (or 637 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 1009640 is about 1004.8084394550. The cubic root of 1009640 is about 100.3203062768.

The spelling of 1009640 in words is "one million, nine thousand, six hundred forty".