687403 has 2 divisors, whose sum is σ = 687404. Its totient is φ = 687402.

The previous prime is 687397. The next prime is 687413. The reversal of 687403 is 304786.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 687403 - 2⁹ = 686891 is a prime.

687403 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (687413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343701 + 343702.

It is an arithmetic number, because the mean of its divisors is an integer number (343702).

2⁶⁸⁷⁴⁰³ is an apocalyptic number.

687403 is a deficient number, since it is larger than the sum of its proper divisors (1).

687403 is an equidigital number, since it uses as much as digits as its factorization.

687403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 687403 is about 829.0977023246. The cubic root of 687403 is about 88.2545573541.

The spelling of 687403 in words is "six hundred eighty-seven thousand, four hundred three".