678403 has 4 divisors (see below), whose sum is σ = 740088. Its totient is φ = 616720.

The previous prime is 678401. The next prime is 678407. The reversal of 678403 is 304876.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 678403 - 2¹ = 678401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (678401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30826 + ... + 30847.

It is an arithmetic number, because the mean of its divisors is an integer number (185022).

2⁶⁷⁸⁴⁰³ is an apocalyptic number.

678403 is a deficient number, since it is larger than the sum of its proper divisors (61685).

678403 is a wasteful number, since it uses less digits than its factorization.

678403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61684.

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

The square root of 678403 is about 823.6522324379. The cubic root of 678403 is about 87.8676989227.

It can be divided in two parts, 678 and 403, that added together give a triangular number (1081 = T₄₆).

The spelling of 678403 in words is "six hundred seventy-eight thousand, four hundred three".