678437 has 2 divisors, whose sum is σ = 678438. Its totient is φ = 678436.

The previous prime is 678421. The next prime is 678451. The reversal of 678437 is 734876.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 417316 + 261121 = 646^2 + 511^2 .

It is a cyclic number.

It is not a de Polignac number, because 678437 - 2⁴ = 678421 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 678397 and 678406.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 678437.

It is not a weakly prime, because it can be changed into another prime (678407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339218 + 339219.

It is an arithmetic number, because the mean of its divisors is an integer number (339219).

2⁶⁷⁸⁴³⁷ is an apocalyptic number.

It is an amenable number.

678437 is a deficient number, since it is larger than the sum of its proper divisors (1).

678437 is an equidigital number, since it uses as much as digits as its factorization.

678437 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28224, while the sum is 35.

The square root of 678437 is about 823.6728719583. The cubic root of 678437 is about 87.8691668072.

The spelling of 678437 in words is "six hundred seventy-eight thousand, four hundred thirty-seven".