663407 has 2 divisors, whose sum is σ = 663408. Its totient is φ = 663406.

The previous prime is 663371. The next prime is 663409. The reversal of 663407 is 704366.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-663407 is a prime.

Together with 663409, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (663409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331703 + 331704.

It is an arithmetic number, because the mean of its divisors is an integer number (331704).

2⁶⁶³⁴⁰⁷ is an apocalyptic number.

663407 is a deficient number, since it is larger than the sum of its proper divisors (1).

663407 is an equidigital number, since it uses as much as digits as its factorization.

663407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 26.

The square root of 663407 is about 814.4980049085. The cubic root of 663407 is about 87.2154347310.

The spelling of 663407 in words is "six hundred sixty-three thousand, four hundred seven".