403240121 has 2 divisors, whose sum is σ = 403240122. Its totient is φ = 403240120.

The previous prime is 403240109. The next prime is 403240147. The reversal of 403240121 is 121042304.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 245360896 + 157879225 = 15664^2 + 12565^2 .

It is a cyclic number.

It is not a de Polignac number, because 403240121 - 2¹⁸ = 402977977 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 403240121.

It is not a weakly prime, because it can be changed into another prime (403240151) 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 as a sum of consecutive naturals, namely, 201620060 + 201620061.

It is an arithmetic number, because the mean of its divisors is an integer number (201620061).

Almost surely, 2^403240121 is an apocalyptic number.

It is an amenable number.

403240121 is a deficient number, since it is larger than the sum of its proper divisors (1).

403240121 is an equidigital number, since it uses as much as digits as its factorization.

403240121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 403240121 is about 20080.8396487796. The cubic root of 403240121 is about 738.7904033567.

Adding to 403240121 its reverse (121042304), we get a palindrome (524282425).

The spelling of 403240121 in words is "four hundred three million, two hundred forty thousand, one hundred twenty-one".