80905939 has 8 divisors (see below), whose sum is σ = 85774208. Its totient is φ = 76178880.

The previous prime is 80905897. The next prime is 80905987. The reversal of 80905939 is 93950908.

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

It is a cyclic number.

It is not a de Polignac number, because 80905939 - 2¹⁵ = 80873171 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 80905895 and 80905904.

It is not an unprimeable number, because it can be changed into a prime (80908939) 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, 34122 + ... + 36415.

It is an arithmetic number, because the mean of its divisors is an integer number (10721776).

Almost surely, 2^80905939 is an apocalyptic number.

80905939 is a deficient number, since it is larger than the sum of its proper divisors (4868269).

80905939 is a wasteful number, since it uses less digits than its factorization.

80905939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70605.

The product of its (nonzero) digits is 87480, while the sum is 43.

The square root of 80905939 is about 8994.7728709512. The cubic root of 80905939 is about 432.5073254353.

The spelling of 80905939 in words is "eighty million, nine hundred five thousand, nine hundred thirty-nine".