78419 has 4 divisors (see below), whose sum is σ = 85560. Its totient is φ = 71280.

The previous prime is 78401. The next prime is 78427. The reversal of 78419 is 91487.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91487 = 11 ⋅8317.

It is not a de Polignac number, because 78419 - 2⁸ = 78163 is a prime.

It is a super-2 number, since 2×78419² = 12299079122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78391 and 78400.

It is not an unprimeable number, because it can be changed into a prime (78439) 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, 3554 + ... + 3575.

It is an arithmetic number, because the mean of its divisors is an integer number (21390).

2⁷⁸⁴¹⁹ is an apocalyptic number.

78419 is a deficient number, since it is larger than the sum of its proper divisors (7141).

78419 is a wasteful number, since it uses less digits than its factorization.

78419 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7140.

The product of its digits is 2016, while the sum is 29.

The square root of 78419 is about 280.0339265161. The cubic root of 78419 is about 42.8029563859.

The spelling of 78419 in words is "seventy-eight thousand, four hundred nineteen".