83978019 has 24 divisors (see below), whose sum is σ = 126393360. Its totient is φ = 55107360.

The previous prime is 83978017. The next prime is 83978021. The reversal of 83978019 is 91087938.

It is an interprime number because it is at equal distance from previous prime (83978017) and next prime (83978021).

It is not a de Polignac number, because 83978019 - 2¹ = 83978017 is a prime.

It is a super-2 number, since 2×83978019² = 14104615350328722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (83978017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 135799 + ... + 136415.

It is an arithmetic number, because the mean of its divisors is an integer number (5266390).

Almost surely, 2^83978019 is an apocalyptic number.

83978019 is a deficient number, since it is larger than the sum of its proper divisors (42415341).

83978019 is an equidigital number, since it uses as much as digits as its factorization.

83978019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 768 (or 691 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The square root of 83978019 is about 9163.9521495914. The cubic root of 83978019 is about 437.9137097791.

The spelling of 83978019 in words is "eighty-three million, nine hundred seventy-eight thousand, nineteen".