2400521 has 2 divisors, whose sum is σ = 2400522. Its totient is φ = 2400520.

The previous prime is 2400511. The next prime is 2400551. The reversal of 2400521 is 1250042.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1990921 + 409600 = 1411^2 + 640^2 .

It is a cyclic number.

It is not a de Polignac number, because 2400521 - 2¹⁰ = 2399497 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 2400496 and 2400505.

It is not a weakly prime, because it can be changed into another prime (2400511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1200260 + 1200261.

It is an arithmetic number, because the mean of its divisors is an integer number (1200261).

2^2400521 is an apocalyptic number.

It is an amenable number.

2400521 is a deficient number, since it is larger than the sum of its proper divisors (1).

2400521 is an equidigital number, since it uses as much as digits as its factorization.

2400521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 2400521 is about 1549.3614813852. The cubic root of 2400521 is about 133.8962774979.

Adding to 2400521 its reverse (1250042), we get a palindrome (3650563).

The spelling of 2400521 in words is "two million, four hundred thousand, five hundred twenty-one".