78391419 has 8 divisors (see below), whose sum is σ = 107346960. Its totient is φ = 50848416.

The previous prime is 78391409. The next prime is 78391421. The reversal of 78391419 is 91419387.

It is a happy number.

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

It is not a de Polignac number, because 78391419 - 2⁵ = 78391387 is a prime.

It is a super-2 number, since 2×78391419² = 12290429145667122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78391409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 353004 + ... + 353225.

It is an arithmetic number, because the mean of its divisors is an integer number (13418370).

Almost surely, 2^78391419 is an apocalyptic number.

78391419 is a deficient number, since it is larger than the sum of its proper divisors (28955541).

78391419 is a wasteful number, since it uses less digits than its factorization.

78391419 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 706269.

The product of its digits is 54432, while the sum is 42.

The square root of 78391419 is about 8853.8928726295. The cubic root of 78391419 is about 427.9793767540.

The spelling of 78391419 in words is "seventy-eight million, three hundred ninety-one thousand, four hundred nineteen".