678429 has 8 divisors (see below), whose sum is σ = 1005120. Its totient is φ = 452268.

The previous prime is 678421. The next prime is 678437. The reversal of 678429 is 924876.

678429 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (678421) and next prime (678437).

It is not a de Polignac number, because 678429 - 2³ = 678421 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 678393 and 678402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678421) 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, 12537 + ... + 12590.

It is an arithmetic number, because the mean of its divisors is an integer number (125640).

2⁶⁷⁸⁴²⁹ is an apocalyptic number.

It is an amenable number.

678429 is a deficient number, since it is larger than the sum of its proper divisors (326691).

678429 is a wasteful number, since it uses less digits than its factorization.

678429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25136 (or 25130 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 678429 is about 823.6680156471. The cubic root of 678429 is about 87.8688214271.

The spelling of 678429 in words is "six hundred seventy-eight thousand, four hundred twenty-nine".