1000401 has 12 divisors (see below), whose sum is σ = 1382256. Its totient is φ = 643560.

The previous prime is 1000397. The next prime is 1000403. The reversal of 1000401 is 1040001.

It is not a de Polignac number, because 1000401 - 2² = 1000397 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1000401.

It is not an unprimeable number, because it can be changed into a prime (1000403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2710 + ... + 3056.

It is an arithmetic number, because the mean of its divisors is an integer number (115188).

2^1000401 is an apocalyptic number.

It is an amenable number.

1000401 is a deficient number, since it is larger than the sum of its proper divisors (381855).

1000401 is an equidigital number, since it uses as much as digits as its factorization.

1000401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 412 (or 381 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 6.

The square root of 1000401 is about 1000.2004799039. The cubic root of 1000401 is about 100.0133648804.

Adding to 1000401 its reverse (1040001), we get a palindrome (2040402).

The spelling of 1000401 in words is "one million, four hundred one", and thus it is an aban number.