83978459 has 4 divisors (see below), whose sum is σ = 84030504. Its totient is φ = 83926416.

The previous prime is 83978443. The next prime is 83978471. The reversal of 83978459 is 95487938.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 83978459 - 2⁴ = 83978443 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 83978459.

It is not an unprimeable number, because it can be changed into a prime (83978159) 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, 23522 + ... + 26855.

It is an arithmetic number, because the mean of its divisors is an integer number (21007626).

Almost surely, 2^83978459 is an apocalyptic number.

83978459 is a deficient number, since it is larger than the sum of its proper divisors (52045).

83978459 is a wasteful number, since it uses less digits than its factorization.

83978459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52044.

The product of its digits is 2177280, while the sum is 53.

The square root of 83978459 is about 9163.9761566691. The cubic root of 83978459 is about 437.9144745892.

The spelling of 83978459 in words is "eighty-three million, nine hundred seventy-eight thousand, four hundred fifty-nine".