684303421 has 2 divisors, whose sum is σ = 684303422. Its totient is φ = 684303420.

The previous prime is 684303391. The next prime is 684303437. The reversal of 684303421 is 124303486.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 503104900 + 181198521 = 22430^2 + 13461^2 .

It is a cyclic number.

It is not a de Polignac number, because 684303421 - 2¹⁹ = 683779133 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (684303481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342151710 + 342151711.

It is an arithmetic number, because the mean of its divisors is an integer number (342151711).

Almost surely, 2^684303421 is an apocalyptic number.

It is an amenable number.

684303421 is a deficient number, since it is larger than the sum of its proper divisors (1).

684303421 is an equidigital number, since it uses as much as digits as its factorization.

684303421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 684303421 is about 26159.1938140303. The cubic root of 684303421 is about 881.2170750001.

The spelling of 684303421 in words is "six hundred eighty-four million, three hundred three thousand, four hundred twenty-one".