687405 has 8 divisors (see below), whose sum is σ = 1099872. Its totient is φ = 366608.

The previous prime is 687403. The next prime is 687413. The reversal of 687405 is 504786.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 687405 - 2¹ = 687403 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687403) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22899 + ... + 22928.

It is an arithmetic number, because the mean of its divisors is an integer number (137484).

2⁶⁸⁷⁴⁰⁵ is an apocalyptic number.

It is an amenable number.

687405 is a deficient number, since it is larger than the sum of its proper divisors (412467).

687405 is a wasteful number, since it uses less digits than its factorization.

687405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45835.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 687405 is about 829.0989084542. The cubic root of 687405 is about 88.2546429463.

The spelling of 687405 in words is "six hundred eighty-seven thousand, four hundred five".