1000040 has 32 divisors (see below), whose sum is σ = 2350080. Its totient is φ = 382272.

The previous prime is 1000039. The next prime is 1000081. The reversal of 1000040 is 400001.

It is a Harshad number since it is a multiple of its sum of digits (5).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is a plaindrome in base 7.

It is a zygodrome in base 7.

It is a junction number, because it is equal to n+sod(n) for n = 999988 and 1000033.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 377 + ... + 1463.

It is an arithmetic number, because the mean of its divisors is an integer number (73440).

2^1000040 is an apocalyptic number.

1000040 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 1000040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1175040).

1000040 is an abundant number, since it is smaller than the sum of its proper divisors (1350040).

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

1000040 is a wasteful number, since it uses less digits than its factorization.

1000040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1121 (or 1117 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 5.

The square root of 1000040 is about 1000.0199998000. The cubic root of 1000040 is about 100.0013333156.

Adding to 1000040 its reverse (400001), we get a palindrome (1400041).

The spelling of 1000040 in words is "one million, forty", and thus it is an aban number and an uban number.