78429 has 8 divisors (see below), whose sum is σ = 112672. Its totient is φ = 48240.

The previous prime is 78427. The next prime is 78437. The reversal of 78429 is 92487.

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

It is not a de Polignac number, because 78429 - 2¹ = 78427 is a prime.

It is a super-2 number, since 2×78429² = 12302216082, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 7.

It is a junction number, because it is equal to n+sod(n) for n = 78396 and 78405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78427) 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, 967 + ... + 1044.

It is an arithmetic number, because the mean of its divisors is an integer number (14084).

2⁷⁸⁴²⁹ is an apocalyptic number.

It is an amenable number.

78429 is a deficient number, since it is larger than the sum of its proper divisors (34243).

78429 is a wasteful number, since it uses less digits than its factorization.

78429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2027.

The product of its digits is 4032, while the sum is 30.

The square root of 78429 is about 280.0517809263. The cubic root of 78429 is about 42.8047757212.

The spelling of 78429 in words is "seventy-eight thousand, four hundred twenty-nine".