1002401 has 4 divisors (see below), whose sum is σ = 1005204. Its totient is φ = 999600.

The previous prime is 1002377. The next prime is 1002403. The reversal of 1002401 is 1042001.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2401 + 1000000 = 49^2 + 1000^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1002401 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1002403) 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 3 ways as a sum of consecutive naturals, for example, 770 + ... + 1611.

It is an arithmetic number, because the mean of its divisors is an integer number (251301).

2^1002401 is an apocalyptic number.

It is an amenable number.

1002401 is a deficient number, since it is larger than the sum of its proper divisors (2803).

1002401 is an equidigital number, since it uses as much as digits as its factorization.

1002401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2802.

The product of its (nonzero) digits is 8, while the sum is 8.

The square root of 1002401 is about 1001.1997802637. The cubic root of 1002401 is about 100.0799693653.

Adding to 1002401 its reverse (1042001), we get a palindrome (2044402).

It can be divided in two parts, 100 and 2401, that multiplied together give a square (240100 = 490²).

The spelling of 1002401 in words is "one million, two thousand, four hundred one".