8437421 has 2 divisors, whose sum is σ = 8437422. Its totient is φ = 8437420.

The previous prime is 8437411. The next prime is 8437433. The reversal of 8437421 is 1247348.

8437421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8094025 + 343396 = 2845^2 + 586^2 .

It is a cyclic number.

It is not a de Polignac number, because 8437421 - 2⁶ = 8437357 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8437411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4218710 + 4218711.

It is an arithmetic number, because the mean of its divisors is an integer number (4218711).

Almost surely, 2^8437421 is an apocalyptic number.

It is an amenable number.

8437421 is a deficient number, since it is larger than the sum of its proper divisors (1).

8437421 is an equidigital number, since it uses as much as digits as its factorization.

8437421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5376, while the sum is 29.

The square root of 8437421 is about 2904.7239111489. The cubic root of 8437421 is about 203.5806858678.

The spelling of 8437421 in words is "eight million, four hundred thirty-seven thousand, four hundred twenty-one".