440120621 has 2 divisors, whose sum is σ = 440120622. Its totient is φ = 440120620.

The previous prime is 440120567. The next prime is 440120623. The reversal of 440120621 is 126021044.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 425596900 + 14523721 = 20630^2 + 3811^2 .

It is a cyclic number.

It is not a de Polignac number, because 440120621 - 2²² = 435926317 is a prime.

It is a super-2 number, since 2×440120621² = 387412322058851282, which contains 22 as substring.

Together with 440120623, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 440120593 and 440120602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (440120623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 220060310 + 220060311.

It is an arithmetic number, because the mean of its divisors is an integer number (220060311).

Almost surely, 2^440120621 is an apocalyptic number.

It is an amenable number.

440120621 is a deficient number, since it is larger than the sum of its proper divisors (1).

440120621 is an equidigital number, since it uses as much as digits as its factorization.

440120621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 440120621 is about 20979.0519566543. The cubic root of 440120621 is about 760.6599882156.

Adding to 440120621 its reverse (126021044), we get a palindrome (566141665).

The spelling of 440120621 in words is "four hundred forty million, one hundred twenty thousand, six hundred twenty-one".