2440421 has 2 divisors, whose sum is σ = 2440422. Its totient is φ = 2440420.

The previous prime is 2440411. The next prime is 2440439. The reversal of 2440421 is 1240442.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2292196 + 148225 = 1514^2 + 385^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2440421 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2440421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2440411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1220210 + 1220211.

It is an arithmetic number, because the mean of its divisors is an integer number (1220211).

2^2440421 is an apocalyptic number.

It is an amenable number.

2440421 is a deficient number, since it is larger than the sum of its proper divisors (1).

2440421 is an equidigital number, since it uses as much as digits as its factorization.

2440421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 2440421 is about 1562.1846881851. The cubic root of 2440421 is about 134.6340523520.

Adding to 2440421 its reverse (1240442), we get a palindrome (3680863).

The spelling of 2440421 in words is "two million, four hundred forty thousand, four hundred twenty-one".