9418421 has 2 divisors, whose sum is σ = 9418422. Its totient is φ = 9418420.

The previous prime is 9418403. The next prime is 9418429. The reversal of 9418421 is 1248149.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5827396 + 3591025 = 2414^2 + 1895^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9418421 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9418429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4709210 + 4709211.

It is an arithmetic number, because the mean of its divisors is an integer number (4709211).

Almost surely, 2^9418421 is an apocalyptic number.

It is an amenable number.

9418421 is a deficient number, since it is larger than the sum of its proper divisors (1).

9418421 is an equidigital number, since it uses as much as digits as its factorization.

9418421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2304, while the sum is 29.

The square root of 9418421 is about 3068.9446068641. The cubic root of 9418421 is about 211.1832000550.

The spelling of 9418421 in words is "nine million, four hundred eighteen thousand, four hundred twenty-one".